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Cheers guys thats most usefull and a gr8 help.

I sit right Nose that you have to be 225mm away from the DPC or can i go closer to it ???

One option you have would be to drill the new hole for your extractor then use the core from that one to plug up the old one, Woooo Hoooo i beat Noseall to one, Yiopppppeeeeeee :D

Hi Guys, Please forgive me if this is in the wrong area wasn't sure if it should be here or in carpentry. Could anyone advise please if they know any websites etc on how to construct a mono pitched roof, I am building a small extension and require this to match up with the existing roof...

Nose i saw this remark you had put on another message, am i right in thinking here Nose that you fill the cavity up to just short of DPC level with concrete ???

Nose just to get this right, are you supposed to fill the cavity below DPC with concrete ???

Yeh i did understand what you were saying reference that but what actually stops the concrete screed going into the cavity ?? am i just relying on the DPM to hold the screed ???

Noseall, had a brainwave today, it still blooming hurts. Would it suffice if a made a concrete step 1200mm long by 300mm wide and approx 20mm thick with reinforcing bars in to cover both courses and the cavity in the floor obviously sat on DPC, then my french doors could sit on this ??? :D

Cheers for that Nose i will nip to the builders yard as soon as me roof windows have arrived, i might need to come back to you later though for a more in depth discussion into that floor cavity tho... :D

Cheers for that Nose, what exactly is it then it looks like a piece of insulation stuck onto some form of more rigid material ?

What sort of cavity closures am i looking at Nose, is there anything in particular i should be looking for ???

Hi Guys, In the process of building my extension in which will hopefully sit a pair of external upvc french doors. The extension has a 90mm cavity all round, my question really is were abouts should the doors sit in relation to the opening (i.e. on the inner skin, outer skin or over the...

Hi Guys, In the process of building my extension in which will hopefully sit a pair of external upvc french doors. The extension has a 90mm cavity all round, my question really is were abouts should the doors sit in relation to the opening (i.e. on the inner skin, outer skin or over the...

As far as im aware my friend the Kingspan goes under the concrete floor. You should have had hard core, blinding sand, DPM, Insulation (Kingspan, Xtratherm or similar) then the concrete and screed.

Morning Guys, I am building my small extension in 3.5 Newton blocks, but yesterday had 60 7 Newton blocks given to me, would it be best to use these on the outer skin or the inner skin, or doesn't it matter ???

A funny, thanx for that woody.

Cheers for that Shytalkz, i think just to play safe i will increase the size of the return to 675mm, i cant be doing with problems at a later date.

Well the extension only requires two walls to be built the wall containing the french doors is 2.25mtrs long then joins to the existing building via stainless steel wall ties, the french doors are 1.2 mtrs wide witch leaves around 1050mm to play with hence returns of 525mm. Now the pillar...

So is that just normal then Noseall, as i was a bit worried about it when i saw it a few days later.

I see on another post that Woody had writen this, is there a minimum size for a corner return as i am building a small extension and my external return is 550mm, this obviously makes the inner leaf even smaller. :(