New extension questions

Joined
21 Jun 2011
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Location
Cheshire
Country
United Kingdom
Hi all

Apologies if these have been asked recently but i've been wondering:-

1.What would be the best combo for a typical foundation to accomodate a single storey lean to extension?

2.I am also slightly confused how to successfully seal a DPM to the existing property which has no DPM but has been damp proofed instead. How can you bridge the two?

3.Is there a preference over egg crate WTF UFH panels or solid polystyrene slabs?

4.Is there is a boiler calc spreadsheet formula i could use to determine boiler?

5.Is there a suitable roofing material/membrane for a roof pitch of 11 degrees? Also is there a tile that can be laid on top without mossing up?

6.The structural engineer has proposed a goalpost steel frame at the rear of the extension so i was wondering how to sit the roof on top of the steel while trying to form an insulated section in front and behind of the steel to avoid condensation.

Thanks for taking the time to read my random questions.
 
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