Challet bungalow roof insulation question

SteveP5B · 4 Dec 2015

How can the sloping roof of a chalet bungalow roof be insulated?
At present the flat ceiling and the upright walls are insulated with a mixture of 100mm mineral wool and celotex , the sloping part of the ceiling has none. What can be done, the rafters are 100mmx50mm and covered obviously in plasterboard and plaster.

garyo · 4 Dec 2015

I'd remove the plaster, put 50mm PIR between the rafters, leaving 50mm air gap under the felt/tiles. Then overboard with 50mm PIR bonded to plasterboard.

The other place you have to check is under the floor boards - sometimes there's no insulation on the between the joist ends meaning that the entire floor/ceiling cavity under the room is outside the thermal envelope of the house. You should be able to get in to the eave to establish the insulation detail at the joist ends.

See this related thread: //www.diynot.com/diy/threads/dormer-windows-roofs-can-you-polish-a-t-rd.446760/

CptKernow · 4 Dec 2015

I was about to post this same question myself. From the loft in our place I can actually see right down the void between the roof and the ceiling. Do you reckon there is anyway of getting something down these gaps without having to go in through the ceiling? The loft itself has plenty of ventilation, but I suppose there would still need to be some airflow in these voids...

SteveP5B · 4 Dec 2015

CptKernow said:
I was about to post this same question myself. From the loft in our place I can actually see right down the void between the roof and the ceiling. Do you reckon there is anyway of getting something down these gaps without having to go in through the ceiling? The loft itself has plenty of ventilation, but I suppose there would still need to be some airflow in these voids...

Sounds a good idea, slide some 50mm celotex straight in. I can't do that so I guess the plasterboard is going to have to come off.

CptKernow · 4 Dec 2015

SteveP5B said:
Sounds a good idea, slide some 50mm celotex straight in. I can't do that so I guess the plasterboard is going to have to come off.

If it was plasterboard I might even think about it. Unfortunately it's lath & plaster.

SteveP5B · 29 Dec 2015

I'm just recovering from Christmas and thinking of starting work soon. I'm looking for a way of cutting the plasterboard neat and tidy and without and mess and dust, is there a machine I can use?
Was thinking of using my circular saw with the blade speed reduced and connect it to a vacuum cleaner?
What is available?

theprinceofdarkness · 29 Dec 2015

However you cut plasterboard, you will generate dust, the thinner the blade the better. A circular saw has a thick blade and it whirling around will spread the dust far and wide. Connecting it to a vacuum cleaner sound quite a good idea, but I think that the filter/bag surface will get blocked quickly.
Frank

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Challet bungalow roof insulation question

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