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PostPosted: Mon May 15, 2017 8:05 pm 
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Hi I live in a 400 year old house and would like to sand the floor and varnish in the living room. Its a dirt floor about a foot down and boards are on suspended joists that rest on brick. My plan had been to lift boards and wedge kingspan between the joists and then put boards down, no dpm, trouble is I'm now getting worried that i'm going to cause lots of problems and introduce damp/ rot. There is no air brick as the house is so old, It has been covered in carpet for a long time with no obvious damp down there . I've lifted some boards which was difficult and before I fully commit to this and potentially damage boards and introduce problems I am seeking any advice, opinion, experience as I keep talking myself in and out of this.

I could lay an engineered board on top with a thin insulation but seems a shame as the boards although just pitchpine look nice sanded up and this would cause bother if i had to lift floor to service the central heating pipes, it would also cost £30sqm!!.

i could just sand it , try and seal an cracks and hope that its not too cold next winter

Or I'll just buy new carpet - the easy solution!

I measured the temp gradient and it was 14 degrees down there and 18 in the room.. That was today though.

Please talk me out of this idea or into it... Thanks for our advice.


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PostPosted: Mon May 15, 2017 8:26 pm 
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You can fit kingspan between the joists, make sure they are a tight fit.
Fit some battens to stop them dropping, and keep them tight under the boards.
You also should have some air vents fitted below.



For this message the author cotswold builders has received gratitude : kman2017
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PostPosted: Mon May 15, 2017 8:47 pm 
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Thanks Problem is the floor level is at/ just below ground level outside so can't put air bricks in without digging outside and that would open up a load of other bother.


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PostPosted: Tue May 16, 2017 8:08 pm 
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kman2017 wrote:
Thanks Problem is the floor level is at/ just below ground level outside so can't put air bricks in without digging outside and that would open up a load of other bother.



You could use a telescopic air vent sleeve which would permit the vent fitted above ground level on the outside and below the floor on the inside. Cotswold is correct, kingspan or equivalent fitted as described and with air vents is the answer.

http://www.screwfix.com/p/telescopic-un ... 15mm/12025

davyp1


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