bradders3109

Thanks Mark

Hi All, We are now well into our self build and have poured the (Nudura) walls for the first floor. This morning the posi joist company arrived with our joists and we have refused the delivery. Since we are not seasoned builders I'm looking for others opinions on the quality that should be expected from a precision product. Please see attached and give us your opinion on the quality of the joists. Defects that we have highlighted are splits in the cords, splits in supporting blocks, supporting blocks are not manufactured tight to the cords and many of the trimmable ends are not centred between the cords.

Hi Adam I did look at Blowerproof but it was more expensive than passive purple.

Hi jfb we are externally insulating the current house and then building an extension with nudura which shouldn't need an airtight membrane.

Hi All, I have finally reached the stage where I need to apply an airtight membrane to the interior of the original house (225mm solid wall, 90 square meters). I don't like the thought of loose membranes and have been looking at passive purple as a sprayed solution. This is coming out expensive and I got to thinking whether a tanking slurry would work as an airtight membrane or any economical alternatives that others have used. thoughts would be very much appreciated.

Thanks for the replies gents. The reassurance and encouragement makes a massive difference to a Virgin self builder. I’ve looked at it again this morning and it’s worse than I originally thought. However 20mm of sharp sand will level it up and cover the eyesore. The positive is that the slab is drying solid although the depth will be variable between 100 and 120mm. Thanks again.

I did screw rails to opposing walls but with trying to mix, barrow into the room and tamp level it got in front of me. The missus was filling buckets ready for the next mix.

lager mate. can't face the claret tonight.

I thank you all very much and am feeling a little better already. I won't try self mixing a slab again though. sharp sand under the celotex it is then.

Would you just leave the sharp sand loose or mix it with cement and SBR to form a screed?

DPM is under the slab but laps up the walls by another 400mm to take it above the celotex and screed.

Already on my fourth bottle ☹️

does it not need to be level for the celotex?

Hi James there will be UFH on the celotex and then 65mm screed.

Hi all, I have today attempted my first concrete slab. It isn't a big room about 2.75m by 3.5m . We are replacing a suspended timber floor so the walls are already built which made things difficult. It was a day full of choice language and despite the best efforts of myself and the ministry of fun we have made a bit of a mess. The result is a slab that rises and falls by up to about 15mm in places. I am thinking that I could go over it with a thin screed or self levelling compound but don't know if this is a good or bad idea. the slab will be covered with 150mm of celotex and a final screed so won't be seen but i'll always know that it isn't level. Is there a product that I can use on a newly laid slab to level it and cover imperfections. Your help and suggestions will be greatly appreciated.