Protection against mold in foundation on piers

[gurrre]

Hello

I have a small cabin of 10m2 built on a plinth foundation with no heating at all.

I would like to tear out the floor, possibly fix the joists, lay down 22mm tongue and groove floorboard, and install an electric underfloor heating system, then pour fiber-reinforced levelling compound over it.

Is this possible even though it will be completely unheated all year except when I turn on the floor heating a little on summer evenings?

Or will something strange happen to the levelling compound when it's minus degrees and such?

And what type of board do you recommend against the ground that is directly under the joists?
Oil-hardened board, asphalt board?
It ventilates well with the plinth foundation, so I hope that ground moisture doesn't damage the joists.

 

[Plupp 405730]

Hi

I have a small cabin of 10m2 built on a pier foundation with no heating at all.

I would like to tear up the floor, possibly fix the joists, lay down a 22mm tongue and groove floor, put in an electric heating cable, and then level over with fiber-reinforced self-leveling compound.

Is this possible even though it will be completely unheated all year except for turning on the floor heating a bit on summer evenings?

Or will something strange happen to the self-leveling compound when it’s freezing and such?

And what type of board do you recommend against the ground that is directly under the joists?
Oil-hardened board, asphalt board?
It ventilates well with the pier foundation, so I hope the ground moisture won’t damage the joists.

What kind of joists do you have and what is the c/c distance between them?

The self-leveling compound can freeze without being damaged as long as you have heat during the work and the time afterward so it reaches its full curing.

Against the ground, I hope it doesn’t lay directly?
None of those you proposed are suitable if it’s close to the ground, so you need to dig out a little to create a bit of air between the ground and the joists; if it's not good, you may need to use a fiber cement board as subflooring.

 

[gurrre]

What kind of joist do you have and what is the c/c distance between the beams?

Self-leveling compound can freeze without taking damage as long as you have heat during the work and afterwards so that it reaches its full curing.,

Hope it's not directly on the ground?
None of the options you suggested are suitable if it's close to the ground, then you'll need to dig a bit to create some air between the ground and the joist. If it doesn't work well, you might need to use a fibercement board as the false ceiling..

Hi

Yes, it's cc60 now, but is cc45 required with self-leveling compound maybe?

Considering a durable 0.2mm plastic on the ground there, but won't that cause a lot of mold under there if I don't manage to load 2m3 of gravel?

 

[Plupp 405730]

Hi

Yes, it's probably cc60 now, but is cc45 required with self-leveling compound perhaps?

I'm considering an age-resistant 0.2mm plastic on the ground there, but then it'll probably accumulate a lot of mold underneath if I don't manage to load on 2m3 of gravel.

Ok, but if you want to take a chance with 60 c/c, make sure to use fiber-reinforced self-leveling compound that you reinforce with a stainless steel mesh and a minimum of about 20mm of self-leveling compound.

But plastic on the ground helps you..

 

[gurrre]

Ok but if you want to take a chance with 60 c/c, make sure to use fiber-reinforced leveling compound that you reinforce with a stainless steel mesh and have at least about 20mm of leveling compound..

But plastic on the ground helps you..

ok maybe I'll throw in some plastic anyway.

Insulation between the studs is not something to consider if it's not heated, is it?

 

[Plupp 405730]

ok maybe should throw some plastic there after all.

Insulation between the studs is not an option if it's not heated, right?

Yes, it absolutely is. But how does it look today, is it completely open?

 

[gurrre]

Yes, it definitely is. But how does it look today, is it completely open?

Haven't opened it up yet, but I can imagine it's without insulation.
Heard that insulation without constant heating is not preferable.

Unless you're dealing with that kind of träfiberisolering and stuff...