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The celing is 12.5 mm plaster board over 50 mm kingspan fixed to 195mm x 50 mm rafters, the rafters are in filled with 100mm kingspan

My room is 4m x 4m and I was looking at fitting 15 5w led downlights do you think this might be a overkill? It's a vaulted ceiling

Can anyone tel me how far I need to keep the kingspan away from the sides and the tops of the downlights, I am going to use 5 w dimmable led

I have a role of tyvek dupoint but I am not sure if it is roofing or wall board cover, Can I use it on my roof?

My velux are 1140 mm and my overall roof length is 3900 is there any rule on positioning the velux? Do I decide it equal or does it not matter?

Do you know what size wall plate I will need if I am going to use 200 mm x 50 mm rafters at 15 degrees?

Is the 100mm between the rafters enough? What is the best way to fix the 50mm up?

Sorry Noseall what does a con' interlocking at 0.45kn/m. Mean?

Sorry I thought I put this on I can get 15* pitch. 3905 mm front to back external 4043 mm with the 15* pitch There is no supports from front to back just back wall plate and front wall plate with two velux 780mm x 1140 mm. Concrete roof tiles Does using 195mm x 47mm C24 seem ok or do I need...

I am just going through a similar project and I am a little concerned about the Low pitch velux How important is the the insulation collar and more so under felt collar and transverse gutter fitted because I was just going to buy the window and flashing kit.

I was going to use 100mm celotex insulation between each rafter and then 25 mm attached to 12mm plaster board over the full ceiling. I was just questioning myself over the rafter sizes I wasn't sure if I needed to go bigger

Hi I am looking at taking my lean-to poly carb roof off and replacing it with a timber and tile roof with two velux windows. My plan was to use 195 x 47mm C24 timbers at 400 centres. The room is 3600 wide and 3800 from the rear of the house to the front of the lean to. I have calculated that...