CLAYTEC D16 dry lining panels are a dry plaster facing material for wall and ceiling

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1 5.3 Clay dry lining panels D Wall construction Dimensions Article No. CLAYTEC e. K Viersen Issued Valid for 12 months, thereafter see Clay dry lining panel Joint reinforcement tape t = 16 mm b = 8 or 10 cm und Clay fine-finish topcoat plaster t = 2 3 mm CLAYTEC D16 dry lining panels are a dry plaster facing material for wall and ceiling 5.3 surfaces in interiors. They are stuck to the substrate with clay mortar. Their excellent sorption characteristics and the accompanying beneficial effect on the room climate, especially in combination with CLAYTEC clay plasters, make them a natural alternative to other drywall building boards. Dry lining panels are used in renovation and modernisation work where wet plasters would be unreasonably laborious or where the drying time of clay plasters is disadvantageous. D16 panels are an ideal way of quickly and easily upgrading homes built in the last half of the twentieth century. The panels unite the advantages of earth building materials and modern drywall construction methods. Plastering walls with dry lining panels improves the comfort levels of room interiors with poorly-insulated external walls or walls made of cold materials such as concrete or sand-lime blockwork, as their warm surface helps reduce energy consumption. They likewise offer an easy way of bring the beneficial effect of open-pore mineral clay plaster surfaces to modern low-energy and passive-house-standard buildings made of timber and composite-wood. 1

2 Clay dry lining panels are also used to renovate surfaces with damaged plaster, holes (e.g. chases for building services), or otherwise unsightly surfaces. They can also be adapted to fit curved surfaces. Because the panels are fixed with water-soluble mortar and can therefore be removed at a later date with practically no damage, they are also suitable for covering historically valuable but nevertheless concealed surfaces in building conservation scenarios. A further important area of application is the cladding of timber and composite-wood surfaces. The panels are made of earths and clay, reed stems and jute as well as plant fibres and mineral aggregates. They are 16 mm thick and measure cm and can be easily cut, fixed and and built on without requiring special tools. The D16 fulfils the needs of professional drywall contractors but are also straightforward enough to be used by self builders. Building materials D16 clay dry lining panels are bonded to the substrate with a clay adhesive mortar (CLAYTEC ). A 25 kg sack produces 17 litres of mortar. On flat surfaces, this is sufficient for approximately 4-6 m². If the adhesive mortar is also applied directly to the reverse side of the panel (for example when applying panels to curved surfaces), more mortar may be required. The surface of the panels should be reinforced with a flax reinforcement fabric mesh (CLAYTEC , ), a glassfibre fabric mesh (CLAYTEC ) or a jute reinforcement mesh (CLAYTEC ). 3 mm 2 mm Per 30 kg Sack After applying reinforcement mesh, the entire surface is plastered with a thin layer of clay fine-finish topcoat plaster (CLAYTEC ). A 30 kg sack is sufficient for 5-7 m² at a thickness of 3 mm. Very smooth finishes (surface finish quality Q3) can be achieved using clay surface filler (CLAYTEC ). A 10 kg sack is sufficient for 20 m². For such applications, a glassfibre mesh (CLAYTEC ) is used across the entire surface. Mortar coverage in m² surface area for different plaster thicknesses Preparation of the substrate An advantage of using clay dry lining panels is the comparatively straightforward preparation of the substrate. Large holes in the substrate should be filled but old paint and even wallpaper can remain in place as long as it is firm and cannot detach from the underlying surface. Loose and moisture-sensitive coatings must be removed. Pre-treatment with a fine-grain universal primer (CLAYTEC to ) improves adhesion of the panels and also prevents the clay adhesive mortar from firming up too quickly. Before work begins, the surface must be stable, dry and dust-free. Existing coats of paint and wallpaper Improving adhesion Applying the dry lining panels The clay adhesive mortar is applied with a notched trowel or spatula (5mm notch size) to the substrate (and in some cases to the reverse side of the panel, see above). The material should coat the entire surface, i.e. also the furrows created by the notched applicator. As the adhesive mortar dries relatively quickly once applied, apply only a limited amount at a time. The individual panels are then pressed firmly into place into the fresh mortar. It is not necessary to additionally bond the panel edges. The panels should be mounted in a staggered arrangement (at least 20 cm, better 30 cm), i.e. the vertical panel joins should not line up. If the panels are being applied to Applying the panels Staggered arrangement 2

3 a substrate made of large-format building boards, the reed stems in the D16 panels should bridge the joins of the underlying panels. The D16 panel joins should not match the panel joins of the underlying substrate. Clay dry lining panels can be cut using a jig-saw or hand-held circular saw. A hardened steel blade is recommended for circular saws. Oscillating cutting machines (e.g. a FEIN- MultiMaster) can also be used. When applying panels to an uneven or curved surfaces, or to overhead surfaces, a second layer of mortar is applied to the reverse side of the panels. The panels should be additionally fixed with clayboard fixing screws or knock-in anchors. The panels can be nailed or screwed right up to the panel edge. The panels can also be applied to curved surfaces by turning the panel so that the direction of the reed stems allows the panel to flex with the curvature. On more tightly curved surfaces, incisions (a couple of mm) can be cut in the rear face of the panel (for example using a carpet cutter knife) to aid bending. On composite-wood boards (e.g. OSB panels), the panels should be additionally fixed with 25 mm galvanized staples (35 mm for ceilings and roof inclines). In bathrooms and other wet rooms, corrosion-free fixings must be used. Cutting Additional fixing Fixing to composite-wood panels Finishing Surfaces clad with clay dry lining panels can be filled or plastered immediately. Gaps of greater than 1 mm that can be filled with clay fine-finish topcoat plaster (granularity mm) should be filled with this mortar prior to applying scrim tape. Dry lining panels are typically reinforced over their entire surface with flax reinforcement fabric mesh (CLAYTEC , ) or glassfibre mesh (CLAYTEC ). If using clay surface filler on walls and ceilings, a glassfibre mesh should be used. The surface is sparingly pre-wetted (fine spray, not too much moisture), and the reinforcement fabric then applied and fixed in place by brushing over with a slurry of fine-finish plaster (CLAYTEC ). If necessary, pre-apply a thin coat of slurry in advance. Jute reinforcement mesh (CLAYTEC ) should instead be bedded in a thin bed of plaster mortar. Joint reinforcement of the panel joints is also possible (see 5.2) but is less effective and more time-consuming. When plastering over dry lining boards applied to wood-based boards, always use full-surface reinforcement mesh. Before any subsequent layers are applied, any filler and slurry or plaster mortar used to bed the reinforcement mesh must be fully dry. The entire surface is then carefully wetted (fine spray). The application thickness of clay fine-finish topcoat plaster is 2-3 mm. This can be directly coated with a clay primer and CLAYFIX Clay Direct or with YOSIMA clay design plaster. The application of a clay surface filler is just sufficient to close the pores of the clay finefinish topcoat plaster and has a thickness of 0.5 mm. The surfaces can be sanded and then given a second thin skim coat. This corresponds to a surface finish quality Q3. A coarse clay topcoat plaster is not suitable for plastering clay dry lining panels. The plaster mortar layer is necessarily thicker, exposing the panels to greater moisture, causing them to possibly warp. Further information on internal plasters made of clay and their finishing options are given in 6.1. Full-surface reinforcement Reinforcement Clay fine-finish topcoat plaster CLAYFIX Clay Direct YOSIMA clay design plaster Don t use coarse clay topcoat plaster Services for gas, water, heating and electricity can be routed beneath the dry plaster layer, i.e. in the old wall surface. Installations 3

4 Please note: The information provided in this worksheet is the product of extensive experience of earth building work and the use of our products. Nevertheless, this technical information cannot be regarded as legally binding. These notes assume a sufficient level of craftsmanship skills and experience, and knowledge of the relevant building trades. The most recent valid edition of this worksheet is always available from Reproduction and publication of these notes or parts thereof is not permitted. Copyright CLAYTEC e.k. Material properties and technical data Table 5.3.1: Full declaration and material values Full declaration of contents Dimensions Bulk density λ -value* µ-value* Earth, clay, perlite, reed stems, hemp, jute mesh, cellulose fibres, starch < 1% cm 16 mm 700 kg/m 3 0,13 W/mK 18 * λ and µ values based on measurements for a D25 clayboard. The corresponding values given in the DVL Lehmbau Regeln (German earth building code) are: λ= 0.21 W/mK, µ= 5/10 4

5 Figure 5.3.1: Applying clay adhesive mortar with a notched spatula to the prepared substrate. Figure 5.3.2: Pressing the clay dry lining panels D16 into place directly after applying the clay adhesive mortar Figure 5.2.3: Working in the reinforcement mesh or joint reinforcement tape (here showing glass fibre scrim tape) Figure : Applying a coat of Claytec fine-finish topcoat plaster to the entire surface after wetting the surface 5

6 Sales and service in Austria: CLAYTEC Lehmbaustoffe GmbH Sackstraße 26 im Hof A-8010 Graz Austria Tel. and Fax +43 (0)316/ CLAYTEC e. K. Nettetaler Straße 113 D Viersen-Boisheim Germany Tel: +49 (0)2153/918-0 Fax: +49 (0)2153/