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Insulating under cabin floor


NSS

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Building a 'log cabin' in the garden and, having laid the bearers today I'm debating whether to add some under floor insulation. Should be a doddle to fit between the bearers as they're raised on brick padstones (see pic). Question is what (Celotex/Ecotherm/etc) and where to buy cheaply? Only need 3 off 2400 x 1200 x 70mm sheets.

 

 

IMG_20190422_1736072.jpg

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6 hours ago, Ferdinand said:

Somebody's offcuts?

 

Or one roll of rockwool or similar.

Thanks, but need to do it this week so offcuts are probably not an option, and not sure I want all sorts of insects nesting in rockwool or the like.

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19 minutes ago, scottishjohn said:

only problem might be it wants to fall out.

 make a ledge with tile baton on the floor beams for insulation to sit on ?

 

Or staple some st/st mig wire from one side to the other underneath so the eps/pir sits on that.

 

Need to stop "things" getting underneath and setting up home too.

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4 minutes ago, Onoff said:

 

Or staple some st/st mig wire from one side to the other underneath so the eps/pir sits on that.

 

Need to stop "things" getting underneath and setting up home too.

I’d fill the whole of the base less 10mm with sharp 20mm gravel, it will drain but won’t provide a “home” for anything. Then use 50mm jablite on battens and it will keep it “warm enough”. 

 

Other option would be to get some big bags of vermiculite and mix it 10:1 with OPC and a little water and pack it between the joists. It will have a fair insulation value if you don’t pack it too much, but will probably be better than having an air gap. 

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There'll be no danger of rats or the like getting under it, and the bricks on which the bearers sit provide a convenient 'lip' to sit the boards on so no need for supporting battens/wire either. It will get damp under there though so main concern is for something that won't absorb moisture and then 'droop'.

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EPS (a.k.a Jablite) would seem to be relatively cheap, moisture resistant and easy to cut to fit.  A squirt of low expansion can foam around the edges would hold it securely into the timber floor framing, although it looks as if it might be OK just resting on the brick ledges.

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4 hours ago, Barney12 said:

You could actually lay the jablite straight over the top and then screw your floor down to the joists creating an EPS sandwich. The jabfloor stuff has an impressive compression strength. 

Except that would make the floor higher than the door threshold ?

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9 hours ago, NSS said:

Except that would make the floor higher than the door threshold ?

 

Could you not add a batten the depth of the proposed insulation, around the base frame perimeter now, to account for this?

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27 minutes ago, Onoff said:

 

Could you not add a batten the depth of the proposed insulation, around the base frame perimeter now, to account for this?

Not really as the bearers are set low so as to minimise the threshold height to make wheelchair access as easy as possible.

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20 minutes ago, daiking said:

Can't help on the insulation front but watching with interest. What's the size and spacing of members? They look like 2x4s?

The bearers are 70 x 45mm (doubled up at front and rear edges) spaced at circa 470mm centres.

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