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    Insulating workshop roof - help / advice needed

    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...
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    Insulating workshop roof - help / advice needed

    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...
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    Insulating workshop roof - help / advice needed

    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
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    Insulating workshop roof - help / advice needed

    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...
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    Insulating workshop roof - help / advice needed

    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...
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    Insulating workshop roof - help / advice needed

    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...
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    Insulating workshop roof - help / advice needed

    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.
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    Insulating workshop roof - help / advice needed

    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...
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