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Hope to solve dormer draught/cold during renovation. What's the best solution?

  • 02-02-2014 7:53pm
    #1
    batman1
    Registered Users, Registered Users 2 Posts: 605 ✭✭✭


    Last year I insulated the attic, crawlspaces and behind the knee walls of my dormer with blown cellulose. This improved the house dramatically. As part of the job the spaces between the ends of the upstairs floor joists were packed with rolled insulation which also helped with heat upstairs. As it stands there is 300mm cellulose on attic floor, 300mm on crawlspace floors and 150mmish behind the knee walls. However due to budget etc the sloping ceilings in the upstairs rooms were left. They have fibreglass fitted between the rafters and plasterboard ceilings. (It's a small house, 9m x 9m square semi d with 45 degree roof pitch. Sloping part of the ceilings are about 6 feet long, front and back.

    We are now at the 'idea' stage of a small rear extension and upgrade of the house in terms of efficiency/airtightness etc and I am hoping to be able to tackle the dormer space properly as part of the job.

    There are 2 items which stand out in terms of the dormer, namely the air/wind tightness and insulation of the sloping ceilings.

    From reading here and elsewhere I am aware of the problems achieving good results but hopefully we can get it done 'once and for all'.

    My understanding is that in order to tackle the wind/airtightness it should be done from outside of the roof. What would be involved and is it possible/feasible in a semi d where the roof is continuous over both houses? (The roof make-up is concrete tiles, battens, bitumen felt on 150mm? rafters with 2 pitched roof dormers and 3 rear velux)
    Would it be a huge cost?

    Alternatively, what are my options on the inside in relation to improving the insulation and airtightness. i.e. can the sloping part of the ceiling be removed, insulation fitted and then redo the ceiling with insulated board or would I have to remove all the ceiling/knee walls and redo the whole upstairs?

    We will of course be engaging an architect for the project as a whole but at this stage we are researching what options we may or may not have.

    Our 'wish list' is to externally insulate, make the house more airtight and fit a proper ventilation system but funds may not stretch that far.


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