Contents. APA Construction Details. Full fill cavity walls Partial fill cavity walls Solid externally insulated walls 26-37

Transcription

1 Contents Pages Full fill cavity walls 2-13 Partial fill cavity walls Solid externally insulated walls Appendix (BRE confirmation of Ψ and y-values) Page 1 of 40 APA Construction Details

2 Full fill cavity walls Applicable range of U-values Walls W/m²K Floors W/m²K Roofs W/m²K The following indicative guidance illustrates good practice for the design and construction of interfaces only in respect to ensuring thermal performance. For detailing ensuring continuity of air barrier, reference should be made to Accredited Details. This guidance must be implemented with due regard to all the other requirements imposed by the Building Regulations. The following y-value can be used in SAP 2005 calculations provided all the junction details of the particular dwelling to which SAP 2005 is being applied, conform these APA Full fill cavity wall details and, where appropriate, the relevant Accredited Details. y = 0.04 Page 2 of 40 APA Detail Numbers: FF - -

3 Full fill cavity walls Ground bearing floor - Insulation below slab Aircrete inner leaf above and below DPC Install perimeter insulation with a minimum R-value of 0.80m²K/W (eg 20mm of insulation with a conductivity of 0.025W/mK) Floor insulation to tightly abut blockwork wall Wall insulation to be continued at least 150mm below top of floor insulation At least one course of aircrete foundation blocks The wall insulation installed below the wall DPC must be fit for purpose with regards to water absorption. be made to Accredited Detail Number: MEI-GF W/mK 0.051W/mK 0.058W/mK Page 3 of 40 APA Detail Number: FF - GF - 01

4 Full fill cavity walls Beam and block floor. Insulation above slab Aircrete inner leaf above and below DPC Install perimeter insulation with a minimum R-value of 0.80m²K/W (eg 20mm of insulation with a conductivity of 0.025W/mK) Floor insulation to tightly abut blockwork wall Wall insulation to be continued at least 150mm below top of floor insulation Beam and aircrete infill block floor At least one course of aircrete foundation blocks The wall insulation installed below the wall DPC must be fit for purpose with regards to water absorption. be made to Accredited Detail Number: MEI-GF-02. Floor span Average value onto wall parallel to wall 0.047W/mK 0.040W/mK 0.044W/mK (Aircrete wall block conductivity = 0.11W/mK) 0.053W/mK 0.048W/mK 0.051W/mK (Aircrete wall block conductivity = 0.15W/mK) 0.059W/mK 0.052W/mK 0.056W/mK (Aircrete wall block conductivity = 0.19W/mK) Page 4 of 40 APA Detail Number: FF - GF - 02

5 Full fill cavity walls Timber intermediate floor Aircrete inner leaf above and below timber floor Continue cavity wall insulation across floor abutment zone. Aircrete infill between joists Suspended timber floors may be laid in joist hangers rather than built in. For timber engineered joists, proprietary filler pieces must be fitted on both sides of the web between the top and bottom flanges (see manufacturers details). be made to Accredited Detail Number: MCI-IF W/mK 0.000W/mK 0.001W/mK Page 5 of 40 APA Detail Number: FF - IF - 01

6 Full fill cavity walls Roof / gable wall. Insulation at ceiling level Aircrete inner leaf above and below ceiling level Ensure that the full depth of insulation between and over joists extends to the inner edge of the wall. Continue cavity wall insulation to top of gable OR 270mm above bottom of ceiling tie and insert cavity tray Pack compressible insulation between last joist and gable wall. The use of over joist insulation is considered best practice as it eliminates the cold bridge caused by the joist. be made to Accredited Detail Number: MCI-RG W/mK 0.054W/mK 0.062W/mK Page 6 of 40 APA Detail Number: FF - RG - 01

7 Full fill cavity walls Roof / eaves. Insulation at ceiling level Ensure the gap between the wall plate and the proprietary eaves ventilator is completely filled with insulation having a minimum R-value across the insulation of 1.2m²K/W. Ensure that the full depth of insulation between and over joists abuts the eaves insulation. Aircrete inner leaf Ensure continuity of the insulation throughout the junction. The use of over joist insulation is considered best practice as it eliminates the cold bridge caused by the joist. Use a proprietary eaves ventilator to ensure ventilation in accordance with BS5250, installed so as not to prevent free water drainage below tiling battens. be made to Accredited Detail Number: MCI-RE W/mK 0.070W/mK 0.071W/mK Page 7 of 40 APA Detail Number: FF - RE - 01

8 Full fill cavity walls Aircrete separating wall / external wall abutment Continue cavity wall insulation across abutment zone. Aircrete inner leaf Aircrete inner leaf Aircrete separating wall Refer to Approved Document B for fire safety requirements and Approved Document E for sound insulation requirements be made to Accredited Detail Number: MCI-IW W/mK 0.065W/mK 0.066W/mK Page 8 of 40 APA Detail Number: FF - IW - 01

9 Full fill cavity walls Dense block separating wall / external wall abutment Continue cavity wall insulation across abutment zone. Aircrete inner leaf Aircrete inner leaf Dense block separating wall Refer to Approved Document B for fire safety requirements and Approved Document E for sound insulation requirements be made to Accredited Detail Number: MCI-IW W/mK 0.075W/mK 0.076W/mK Page 9 of 40 APA Detail Number: FF - IW - 02

10 Full fill cavity walls Windows and doors. Lintels (insulated base plate) Aircrete inner leaf Minimum frame overlap to be 30mm. Ensure insulation having a minimum R-value of 0.6m²W/K overlaps the window frame and lintel base plate. (eg 15mm of insulation with a conductivity of 0.025W/mK). Ensure that all gaps around and between lintels are filled with tightly packed insulation material. be made to Accredited Detail Number: MCI-WD W/mK 0.214W/mK 0.222W/mK Page 10 of 40 APA Detail Number: FF - WD - 01

11 Full fill cavity walls Windows and doors. Lintels (not continuous base plate) Aircrete inner leaf Minimum frame overlap to be 30mm. Lintel to be fully insulated and must not have a continuous base plate. Ensure that all gaps around and between lintels are filled with tightly packed insulation material. be made to Accredited Detail Number: MCI-WD W/mK 0.219W/mK 0.223W/mK Page 11 of 40 APA Detail Number: FF - WD - 02

12 Full fill cavity walls Windows and doors. Sills Install a proprietary cavity closer or block of insulation having a minimum thermal resistance path through the closer of not less than 0.45m²K/W (manufacturers certified data). Minimum frame overlap to be 30mm. Aircrete inner leaf be made to Accredited Detail Number: MCI-WD W/mK 0.017W/mK 0.017W/mK Page 12 of 40 APA Detail Number: FF - WD - 03

13 Full fill cavity walls Windows and doors. Jambs Minimum frame overlap to be 30mm. Aircrete inner leaf Install a proprietary cavity closer or block of insulation having a minimum thermal resistance path through the closer of not less than 0.45m²K/W (manufacturers certified data). be made to Accredited Detail Number: MCI-WD W/mK 0.017W/mK 0.017W/mK Page 13 of 40 APA Detail Number: FF - WD - 04

14 Partial fill cavity walls Applicable range of U-values Walls W/m²K Floors W/m²K Roofs W/m²K The following indicative guidance illustrates good practice for the design and construction of interfaces only in respect to ensuring thermal performance. For detailing ensuring continuity of air barrier, reference should be made to Accredited Details. This guidance must be implemented with due regard to all the other requirements imposed by the Building Regulations. The following y-value can be used in SAP 2005 calculations provided all the junction details of the particular dwelling to which SAP 2005 is being applied, conform to these APA Partial fill cavity wall details and, where appropriate, the relevant Accredited Details. y = 0.04 Page 14 of 40 APA Detail Numbers: PF - -

15 Partial fill cavity walls Ground bearing floor - Insulation below slab Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Aircrete inner leaf above and below DPC Install perimeter insulation with a minimum R-value of 0.80m²K/W (eg 20mm of insulation with a conductivity of 0.025W/mK) Floor insulation to tightly abut blockwork wall Wall insulation to be continued at least 150mm below top of floor insulation At least one course of aircrete foundation blocks The wall insulation installed below the wall DPC must be fit for purpose with regards to water absorption. be made to Accredited Detail Number: MCI-GF W/mK 0.055W/mK 0.061W/mK Page 15 of 40 APA Detail Number: PF - GF - 01

16 Partial fill cavity walls Beam and block floor. Insulation above slab Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Aircrete inner leaf above and below DPC Install perimeter insulation with a minimum R-value of 0.80m²K/W (eg 20mm of insulation with a conductivity of 0.025W/mK) Floor insulation to tightly abut blockwork wall Wall insulation to be continued at least 150mm below top of floor insulation Beam and aircrete infill block floor At least one course of aircrete foundation blocks The wall insulation installed below the wall DPC must be fit for purpose with regards to water absorption. be made to Accredited Detail Number: MEI-GF-02. Floor span Average value onto wall parallel to wall 0.040W/mK 0.040W/mK 0.040W/mK (Aircrete wall block conductivity = 0.11W/mK) 0.045W/mK 0.047W/mK 0.046W/mK (Aircrete wall block conductivity = 0.15W/mK) 0.056W/mK 0.052W/mK 0.054W/mK (Aircrete wall block conductivity = 0.19W/mK) Page 16 of 40 APA Detail Number: PF - GF - 02

17 Aircrete inner leaf above and below timber floor Partial fill cavity walls Timber intermediate floor Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Continue cavity wall insulation across floor abutment zone. Aircrete infill between joists Suspended timber floors may be laid in joist hangers rather than built in. For timber engineered joists, proprietary filler pieces must be fitted on both sides of the web between the top and bottom flanges (see manufacturers details). be made to Accredited Detail Number: MCI-IF W/mK 0.001W/mK 0.001W/mK Page 17 of 40 APA Detail Number: PF - IF - 01

18 Partial fill cavity walls Roof / gable wall. Insulation at ceiling level Aircrete inner leaf above and below ceiling level Ensure that the full depth of insulation between and over joists extends to the inner edge of the wall. Continue cavity wall insulation to top of gable OR 270mm above bottom of ceiling tie and insert cavity tray Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Pack compressible insulation between last joist and gable wall. The use of over joist insulation is considered best practice as it eliminates the cold bridge caused by the joist. be made to Accredited Detail Number: MCI-RG W/mK 0.055W/mK 0.062W/mK Page 18 of 40 APA Detail Number: PF - RG - 01

19 Partial fill cavity walls Roof / eaves. Insulation at ceiling level Ensure the gap between the wall plate and the proprietary eaves ventilator is completely filled with insulation having a minimum R-value across the insulation of 1.2m²K/W. Ensure that the full depth of insulation between and over joists abuts the eaves insulation. Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Aircrete inner leaf Ensure continuity of the insulation throughout the junction. The use of over joist insulation is considered best practice as it eliminates the cold bridge caused by the joist. Use a proprietary eaves ventilator to ensure ventilation in accordance with BS5250, installed so as not to prevent free water drainage below tiling battens. be made to Accredited Detail Number: MCI-RE W/mK 0.070W/mK 0.071W/mK Page 19 of 40 APA Detail Number: PF - RE - 01

20 Partial fill cavity walls Aircrete separating wall / external wall abutment Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Insulation across abutment zone. Aircrete inner leaf Aircrete inner leaf Aircrete separating wall Refer to Approved Document B for fire safety requirements and Approved Document E for sound insulation requirements be made to Accredited Detail Number: MCI-IW W/mK 0.078W/mK 0.078W/mK Page 20 of 40 APA Detail Number: PF - IW - 01

21 Partial fill cavity walls Dense block separating wall / external wall abutment Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Insulation across abutment zone. Aircrete inner leaf Aircrete inner leaf Dense block separating wall Refer to Approved Document B for fire safety requirements and Approved Document E for sound insulation requirements be made to Accredited Detail Number: MCI-IW W/mK 0.092W/mK 0.091W/mK Page 21 of 40 APA Detail Number: PF - IW - 02

22 Partial fill cavity walls Windows and doors. Lintels (insulated base plate) Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Aircrete inner leaf Minimum frame overlap to be 30mm. Ensure insulation having a minimum R-value of 0.6m²W/K overlaps the window frame and lintel base plate. (eg 15mm of insulation with a conductivity of 0.025W/mK). Ensure that all gaps around and between lintels are filled with tightly packed insulation material. be made to Accredited Detail Number: MCI-WD W/mK 0.208W/mK 0.218W/mK Page 22 of 40 APA Detail Number: PF - WD - 01

23 Partial fill cavity walls Windows and doors. Lintels (not continuous base plate) Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Aircrete inner leaf Lintel to be fully insulated and must not have a continuous base plate. Minimum frame overlap to be 30mm. Ensure that all gaps around and between lintels are filled with tightly packed insulation material. be made to Accredited Detail Number: MCI-WD W/mK 0.234W/mK 0.239W/mK Page 23 of 40 APA Detail Number: PF - WD - 02

24 Partial fill cavity walls Windows and doors. Sills Install a proprietary cavity closer or block of insulation having a minimum thermal resistance path through the closer of not less than 0.45m²K/W (manufacturers certified data). Minimum frame overlap to be 30mm. Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Aircrete inner leaf be made to Accredited Detail Number: MCI-WD W/mK 0.017W/mK 0.017W/mK Page 24 of 40 APA Detail Number: PF - WD - 03

25 Partial fill cavity walls Windows and doors. Jambs Partial fill insulation to be secured firmly against the inner leaf of the cavity wall Minimum frame overlap to be 30mm. Aircrete inner leaf Install a proprietary cavity closer or block of insulation having a minimum thermal resistance path through the closer of not less than 0.45m²K/W (manufacturers certified data). be made to Accredited Detail Number: MCI-WD W/mK 0.017W/mK 0.017W/mK Page 25 of 40 APA Detail Number: PF - WD - 04

26 Solid externally insulated walls Applicable range of U-values Walls W/m²K Floors W/m²K Roofs W/m²K The following indicative guidance illustrates good practice for the design and construction of interfaces only in respect to ensuring thermal performance. For detailing ensuring continuity of air barrier, reference should be made to Accredited Details. This guidance must be implemented with due regard to all the other requirements imposed by the Building Regulations. The following y-value can be used in SAP 2005 calculations provided all the junction details of the particular dwelling to which SAP 2005 is being applied, conform to these APA Solid externally insulated wall details and, where appropriate, the relevant Accredited Details. Page 26 of 40 y = 0.02 y = 0.03 (for aircrete blocks with a thermal conductivity of 0.11W/mK) (all other aircrete blocks) APA Detail Numbers: EI - -

27 Solid externally insulated walls Ground bearing floor - Insulation below slab Solid aircrete wall above and below DPC Install perimeter insulation with a minimum R-value of 0.80m²K/W (eg 20mm of insulation with a conductivity of 0.025W/mK) Wall insulation below DPC to have a minimum R-value of 2.11m²K/W Floor insulation to tightly abut blockwork wall Wall insulation below DPC to be continued at least 200mm below top of floor insulation At least one course of aircrete foundation blocks The wall insulation installed below the wall DPC must be fit for purpose with regards to water absorption. be made to Accredited Detail Number: MEI-GF W/mK 0.061W/mK 0.070W/mK Page 27 of 40 APA Detail Number: EI - GF - 01

28 Solid externally insulated walls Beam and block floor. Insulation above slab Solid aircrete wall above and below DPC Install perimeter insulation with a minimum R-value of 0.80m²K/W (eg 20mm of insulation with a conductivity of 0.025W/mK) Wall insulation below DPC to have a minimum R-value of 2.11m²K/W Floor insulation to tightly abut blockwork wall Wall insulation below DPC to be continued at least 200mm below top of floor insulation Beam and aircrete infill block floor At least one course of aircrete foundation blocks The wall insulation installed below the wall DPC must be fit for purpose with regards to water absorption. be made to Accredited Detail Number: MEI-GF-02. Floor span Average value onto wall parallel to wall 0.050W/mK 0.044W/mK 0.047W/mK (Aircrete wall block conductivity = 0.11W/mK) 0.062W/mK 0.054W/mK 0.058W/mK (Aircrete wall block conductivity = 0.15W/mK) 0.075W/mK 0.062W/mK 0.069W/mK (Aircrete wall block conductivity = 0.19W/mK) Page 28 of 40 APA Detail Number: EI - GF - 02

29 Solid externally insulated walls Timber intermediate floor Solid aircrete wall above and below timber floor Aircrete infill between joists Continue wall insulation across floor abutment zone. Aircrete infill across joists where joists do not bear on full width of wall Suspended timber floors may be laid in joist hangers rather than built in. For timber engineered joists, proprietary filler pieces must be fitted on both sides of the web between the top and bottom flanges (see manufacturers details). be made to Accredited Detail Number: MEI-IF W/mK 0.001W/mK 0.000W/mK Page 29 of 40 APA Detail Number: EI - IF - 01

30 Solid externally insulated walls Roof / gable wall. Insulation at ceiling level Solid aircrete wall above and below ceiling Ensure that the full depth of insulation between and over joists extends to the inner edge of the wall. Continue wall insulation to top of gable Pack compressible insulation between last joist and gable wall. The use of over joist insulation is considered best practice as it eliminates the cold bridge caused by the joist. be made to Accredited Detail Number: MEI-RG W/mK 0.065W/mK 0.076W/mK Page 30 of 40 APA Detail Number: EI - RG - 01

31 Solid externally insulated walls Roof / eaves. Insulation at ceiling level Ensure the gap between the wall plate and the proprietary eaves ventilator is completely filled with insulation having a minimum R-value across the insulation of 1.2m²K/W. Ensure that the full depth of insulation between and over joists abuts the eaves insulation. Solid aircrete wall Ensure continuity of the insulation throughout the junction. The use of over joist insulation is considered best practice as it eliminates the cold bridge caused by the joist. Use a proprietary eaves ventilator to ensure ventilation in accordance with BS5250, installed so as not to prevent free water drainage below tiling battens. be made to Accredited Detail Number: MEI-RE W/mK 0.070W/mK 0.071W/mK Page 31 of 40 APA Detail Number: EI - RE - 01

32 Solid externally insulated walls Aircrete separating wall / external wall abutment Continue wall insulation across abutment zone. Proprietary cavity sock (conductivity not more than 004W/m²K) Solid aircrete external wall Solid aircrete external wall Aircrete separating wall Refer to Approved Document B for fire safety requirements and Approved Document E for sound insulation requirements be made to Accredited Detail Number: MCI-IW W/mK 0.059W/mK 0.059W/mK (External wall block conductivity = 0.11W/mK) (External wall block conductivity = 0.15W/mK) (External wall block conductivity = 0.19W/mK) Page 32 of 40 APA Detail Number: EI - IW - 01

33 Solid externally insulated walls Dense block separating wall / external wall abutment Continue wall insulation across abutment zone. Proprietary cavity sock (conductivity not more than 004W/m²K) Solid aircrete external wall Solid aircrete external wall Dense block separating wall Refer to Approved Document B for fire safety requirements and Approved Document E for sound insulation requirements be made to Accredited Detail Number: MCI-IW W/mK 0.078W/mK 0.077W/mK (External wall block conductivity = 0.11W/mK) (External wall block conductivity = 0.15W/mK) (External wall block conductivity = 0.19W/mK) Page 33 of 40 APA Detail Number: EI - IW - 02

34 Solid externally insulated walls Windows and doors. Lintels (insulated base plate) Solid aircrete wall Ensure insulation having a minimum R-value of 0.6m²W/K overlaps the window frame/packing piece and lintel base plate. (eg 15mm of insulation with a conductivity of 0.025W/mK). be made to Accredited Detail Number: MEI-WD W/mK 0.028W/mK 0.027W/mK Page 34 of 40 APA Detail Number: EI - WD - 01

35 Solid externally insulated walls Windows and doors. Lintels be made to Accredited Detail Number: MEI-WD W/mK 0.000W/mK 0.000W/mK Page 35 of 40 APA Detail Number: EI - WD - 02

36 Solid externally insulated walls Windows and doors. Sills Wall insulation carried up to underside of sill member. Solid aircrete wall be made to Accredited Detail Number: MEI-WD W/mK 0.012W/mK 0.013W/mK Page 36 of 40 APA Detail Number: EI - WD - 03

37 Solid externally insulated walls Windows and doors. Jambs Ensure insulation having a minimum R-value of 0.6m²W/K overlaps the window frame/packing piece and lintel base plate. (eg 15mm of insulation with a conductivity of 0.025W/mK). Solid aircrete wall be made to Accredited Detail Number: MEI-WD W/mK 0.033W/mK 0.037W/mK Page 37 of 40 APA Detail Number: EI - WD - 04

38 Appendix BRE confirmation of Ψ and y-values Page 38 of 40 BRE Letter: HCT002/247482

39 Appendix BRE confirmation of Ψ and y-values Table 1 Page 39 of 40

40 Appendix BRE confirmation of Ψ and y-values Table 2 Page 40 of 40