Thanks Alastair
I would like to do option 2 but i am concerned that i may not be able to achieve a full seal and in that case option 1 to vent the roof may be more forgiving and give me more security that the roofing will not mould and rot.
The problem i have so far is that we boarded the...
Hi
Thanks - i have 2 options as i already have the 140mm cellotex
1. Extend my rafters down 50mm to make them 200 deep and fit the celotex between to the lower edge making a vent above approx 50mm - then install soffitt and ridge vents - then on the inside seal joints and maybe poly...
Hi
Can anyone else help with this please - all the information is in my original post with material specifications i am using
I need to knpow if i need to adopt a vented carthedral roof design or unvented or any other design ?
thanks
Please excuse the confusion. This is a completely open barn with no horizontal ceilings. It has a 30 degree pitched roof meeting at a central ridge. Sorry I thought that an internal open sloped ceiling meant vaulted ? I want to board it out on the inside after insulating it and then paint the...
The internal surface needs to be faced with plywood to enable painting and to enable seeing a surface to the vaulted ceiling. Presume from this I will have to lower my Celotex and vent each rafter run from eave to ridge to form a cold roof ? That is venting above the Celotex and below the...
I am trying to understand - you are saying i should put in a second tyvek layer on the inside of my cellotex insulation and rafters ?
Which way round should this tyvek be and what will be its purpose ?
Can i then fit the internal ply ceiling over the top ?
I am trying to eliminate the...
Which plywood are you referring to external or internal ? And what type of breather membrane ? I already have a tyvek supro breather membrane under my slates on top of the external plywood.
Hi
I would like some advice on a roof i am currently insulating
I have a pitched roof barn/workshop which i am trying to insulate
The roof is constructed with 6" deep rafters , the rafters are then boarded externally with 18mm plywood which is covered with Tyvek Supro breather membrane and...