I'm going to lay 18mm tumbled limestone 60x40cm in the newly extended hall.
The substrate is a wooden joist (cellar below) spaced at 40cm centers. Glued flooring chipboard with underfloor heating pipe and heat distribution plate.
1. Do I need to reinforce the joists? I see that 30cm centers are sometimes recommended.
2. Is one layer of floor gypsum enough? Then adhesive and stone. Or does self-leveling compound offer advantages? Which method builds up the most?
Never wrong to add kortla in this context. The base needs to be as stiff as possible. It is also possible to glue spånplatta to the underside of the joists to create a torsion box that is as stiff as a massive joist.
How large is the area? How much should the limestone floor build up in total above the underfloor heating plates?
Never wrong to card in this context. The base needs to be as rigid as possible. You can also glue chipboard on the underside of the joists to create a torsion box that is as stiff as a solid joist.
How large is the area? How much will the limestone floor build in total above the underfloor heating plates?
Thank you,
The area is 13m2.
We are deciding between limestone floors 10 or 18mm thick. So in total, it would be 13 mm floor gypsum + about 4mm adhesive + 18 stone = 35mm.
Alternatively, 25mm with the thinner slab.
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