Slate in interior use
1. Subconstruction
The subconstruction for paving slabs must be clean, dry and free of cracks and other impairments.
Structural elements which are subject to moisture penetration or for which moisture penetration can be assumed must be protected using suitable seals.
Heat and noise protection measures in accordance with DIN 4108 and 4109.
Floating screed flooring in accordance with DIN 18560.
The type of laying and subconstruction must be selected in accordance with the possibilities on site.
1.1. Laying in thick or mortar bed
The subconstruction must be thoroughly cleaned and wetted in the laying area. The slabs are laid on a bed of trass cement mortar at a mixture ratio of 1:4, earth-moist. The slabs can also have an adhesion emulsion rubbed into their back surfaces to bind any grease content and to form a connection between mortar and slate. The slabs must be laid on mortar over the full surface area without voids. Any slight thickness differences in the case of slabs split on both sides can be evened out by pressing into the mortar bed and aligning. Do not allow the floor to be walked on during the drying period. Connection joints to other structural components may only be made as elastic joints at least 5 mm wide.
We do not recommend laying without joints. Slate tends to "work" due to temperature fluctuations. We recommend joints of between 3 and 5 mm in width. The joint width should be adapted to suit the slab size. We recommend the use of trass joint mortar for jointing. When using, observe information given by the manufacturer.
1.2. Laying on thin-bed mortar
This type of laying only allows a very restricted height adjustment in comparison to laying on thick-bed mortar. We therefore recommend that you lay slabs with milled bottom surfaces. It is imperative that the screed top surface is level. Any possible unevenness can be evened out by applying a self-levelling correction mass.
We recommend "Flex tile adhesive" for gluing to cement screed surfaces. Please observe the manufacturer's laying instructions.
Do not lay slabs without joints, the joint width should be between 3 and 5 mm. The joint width should be adapted to suit the slab size. Use Flex joint mortar for jointing.
1.3. Laying on underfloor heating
Slate is very suitable for laying on underfloor heating, since it is a good thermal reservoir.
Before laying, the underfloor heating must be heated up the several days with the temperature set higher each day until maximum. Then the temperature needs to be reduced to the minimum in stages to release stresses in the flooring. The subconstruction must have cooled down completely before the slates are laid.
Slate can be laid on all underfloor heating systems, substructure must be cement screed with AKS reinforcing. Laying in thick or thin-bed mortar as described above.
1.4. Laying as wallcovering or skirting board
Slate wallcoverings or skirting boards can be attached using flex tile adhesive as for flooring slabs. A slab thickness of 10 mm is sufficient. The joint width must be adapted to suit the slab size.
Gypsum plaster walls must be primed with a wash primer before attaching slate slabs.
2. Laying examples
2.1. Excess length bond
2.2. Rectangular bond
2.3. Square bond
3. Interior window sills
The standard version is with rough split window sill top surfaces, visible edges and heads are ground and chamfered. Ground top surfaces are also, of course, available.
4. Cover slabs
Slate as a material for a wide range of interior design offers numerous possibilities for unusual interior design features:
Please contact us with details of your requirements.
The subconstruction for paving slabs must be clean, dry and free of cracks and other impairments.
Structural elements which are subject to moisture penetration or for which moisture penetration can be assumed must be protected using suitable seals.
Heat and noise protection measures in accordance with DIN 4108 and 4109.
Floating screed flooring in accordance with DIN 18560.
The type of laying and subconstruction must be selected in accordance with the possibilities on site.
1.1. Laying in thick or mortar bed
The subconstruction must be thoroughly cleaned and wetted in the laying area. The slabs are laid on a bed of trass cement mortar at a mixture ratio of 1:4, earth-moist. The slabs can also have an adhesion emulsion rubbed into their back surfaces to bind any grease content and to form a connection between mortar and slate. The slabs must be laid on mortar over the full surface area without voids. Any slight thickness differences in the case of slabs split on both sides can be evened out by pressing into the mortar bed and aligning. Do not allow the floor to be walked on during the drying period. Connection joints to other structural components may only be made as elastic joints at least 5 mm wide.
We do not recommend laying without joints. Slate tends to "work" due to temperature fluctuations. We recommend joints of between 3 and 5 mm in width. The joint width should be adapted to suit the slab size. We recommend the use of trass joint mortar for jointing. When using, observe information given by the manufacturer.
1.2. Laying on thin-bed mortar
This type of laying only allows a very restricted height adjustment in comparison to laying on thick-bed mortar. We therefore recommend that you lay slabs with milled bottom surfaces. It is imperative that the screed top surface is level. Any possible unevenness can be evened out by applying a self-levelling correction mass.
We recommend "Flex tile adhesive" for gluing to cement screed surfaces. Please observe the manufacturer's laying instructions.
Do not lay slabs without joints, the joint width should be between 3 and 5 mm. The joint width should be adapted to suit the slab size. Use Flex joint mortar for jointing.
1.3. Laying on underfloor heating
Slate is very suitable for laying on underfloor heating, since it is a good thermal reservoir.
Before laying, the underfloor heating must be heated up the several days with the temperature set higher each day until maximum. Then the temperature needs to be reduced to the minimum in stages to release stresses in the flooring. The subconstruction must have cooled down completely before the slates are laid.
Slate can be laid on all underfloor heating systems, substructure must be cement screed with AKS reinforcing. Laying in thick or thin-bed mortar as described above.
1.4. Laying as wallcovering or skirting board
Slate wallcoverings or skirting boards can be attached using flex tile adhesive as for flooring slabs. A slab thickness of 10 mm is sufficient. The joint width must be adapted to suit the slab size.
Gypsum plaster walls must be primed with a wash primer before attaching slate slabs.
2. Laying examples
2.1. Excess length bond
- In one or various strip widths of 15 - 50 cm, staggered by 5 cm
- in lengths as received from the works
2.2. Rectangular bond
- in one or various strip widths of 15 - 50 cm, staggered by 5 cm
- in adapted works lengths, laid as excess length bond (English bond) symmetrical, as alternating bond.
2.3. Square bond
- in side lengths of 15 - 50 cm, lay diagonally or straight
- in 2 sizes as offset square bond
3. Interior window sills
The standard version is with rough split window sill top surfaces, visible edges and heads are ground and chamfered. Ground top surfaces are also, of course, available.
4. Cover slabs
Slate as a material for a wide range of interior design offers numerous possibilities for unusual interior design features:
- as a tabletop to your requirements
- for the decoration of fireplaces and ovens
- cover slabs for kitchen and bathroom
Please contact us with details of your requirements.
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