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Insulating roof space
Grandad2b
Posts: 311 Forumite
We have an early 70s brick built house with concrete tiled roof. There is black roofing felt beneath the tiles. There is about 100mm fibreglass insulation between the ceiling joists but most of the area has been boarded out.
We're wondering what is the best way to increase the insulation - do we aim to put some kind of material between and/or below the rafters or should we be taking up the boards, increasing the depth of the joists and installing further insulation before replacing the boards?
We're wondering what is the best way to increase the insulation - do we aim to put some kind of material between and/or below the rafters or should we be taking up the boards, increasing the depth of the joists and installing further insulation before replacing the boards?
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Comments
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try something like loftzone then replace the boards1
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Typically, a house like yours was built with the intention that the loft space should be ventilated. Loft floor insulation (like fibreglass) allows air from below to percolate through very slowly and so remove moisture from the house below, enter the loft and then get vented away. So insulating between the rafters might prevent this or alternatively it might be ineffective if your loft space ventilation is under the eaves.Reed1
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Yes, agree with the above. Had the same problem and took advice, which was to remove the boards, top up the insulation making sure not to obstruct the roof space ventilation and then make a new storage platform on stilts over the new insulation. A messy time consuming job but the effect on heating bills was dramatic and certainly worth the effort.1
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Do you need it all boarded? Consider lifting all of the boards. Create a walkway on the stilts, you could probably have at least 200 of insulation under that. The remaining area at 300, put shelves up on the roof struts for your storage1
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@paul991 Not heard of that before
@Reed_Richards @mmmmikey I think the ventilation is at the eaves.
@andyg9053 Worth looking at
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Grandad2b said:Reed0
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I had a similar situation, and when I wanted to upgrade I laid celotex over the boarded areas and then boarded on top of that again.I've also put reflective insulating foil over the rafters which still allows ventilation at the eaves.0
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Reed_Richards said:Grandad2b said:
Edit .. doesn't want to embed the image, see link ..
https://i.pinimg.com/originals/ba/b2/eb/bab2ebd88bff261b9b92cf1f25a5136a.jpg
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silverwhistle said:I had a similar situation, and when I wanted to upgrade I laid celotex over the boarded areas and then boarded on top of that again.I've also put reflective insulating foil over the rafters which still allows ventilation at the eaves.0
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moist air from the upstairs rooms needs to be able to escape either though the plasterboard and insulation or a trickle fan in a upstairs room0
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