We are going to build a year-round conservatory on piers, with water-based underfloor heating. I have some questions about the bottom plate that I hope someone can advise me on.
I was thinking of using Byggmax fiber cement board as the bottom plate to avoid boards that warp.
Do they need more bracing than just placing them in 60cc slots and screwing them into 22x95 that you first nailed under the joists? Maybe thinking under the joints?
Once these fiber boards are placed in the slots and screwed, should you lay some paper on top before putting in the insulation? And how do you best seal around the bottom plates to keep mice out?
I would be extremely grateful for answers from someone who has built a bit and knows what works
I was thinking of using Byggmax fiber cement board as the bottom plate to avoid boards that warp.
Do they need more bracing than just placing them in 60cc slots and screwing them into 22x95 that you first nailed under the joists? Maybe thinking under the joints?
Once these fiber boards are placed in the slots and screwed, should you lay some paper on top before putting in the insulation? And how do you best seal around the bottom plates to keep mice out?
I would be extremely grateful for answers from someone who has built a bit and knows what works
I was involved in a construction project where we used fiber cement boards in the subfloor. I remember we applied a bead of sealant to the underboard, then we just placed the boards (did not screw them down). Unfortunately, I don't recall how we dealt with the short sides. I would have checked if there is an H-profile with the right dimensions that you can use to get a reasonably tight seam. These are available for outdoor gypsum, for example.
Then I don't know if I would have installed underfloor heating on a joist structure on pillars. It seems like you might need to at least break the thermal bridge with a layer of insulation if you're going to have underfloor heating. But maybe you have that figured out.
Then I don't know if I would have installed underfloor heating on a joist structure on pillars. It seems like you might need to at least break the thermal bridge with a layer of insulation if you're going to have underfloor heating. But maybe you have that figured out.
I built a well-insulated friggebod on piers last year and used Byggmax fiber cement boards in the subfloor. I glued them to the underside board with outdoor sealant. To seal the joints between the short sides of the boards, I sawed 10cm pieces of a board and glued them on top of the joints. I placed the insulation directly on the boards.
I screwed Bmax fiber cement board from underneath last year on an extension. I have joists with cc300, didn't feel like cutting the boards.
Festool angle drill on the screwdriver
Pre-drilled the boards
Good if you have patience
Festool angle drill on the screwdriver
Pre-drilled the boards
Good if you have patience
I tried screwing but the board was really hard, so I tried pre-drilling, but still got a crack because I thought the head should be level with the board. Didn't work, I can't go around pre-drilling and countersinking hundreds of screws either.T TMatt said:
If I run a bead of outdoor sealant and just lay on the boards, do you think Byggmax outdoor sealant is sufficient?
I find it soft after several days, but maybe that's unimportant for a trossbottenskiva?
Wouldn't it be easier with stone glue, a fantastic adhesive that is quick to apply and bonds and seals most things. One tube goes a very long way.G gluecifer said:
https://www.biltema.se/bygg/kemikalier/lim/stenlim-2000029972