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PostPosted: Wed Sep 20, 2017 1:42 am 
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Everywhere I read about insulation it is stated that the loft insulation needs to be continuous with the cavity wall insulation.

This is certainly not the case in our house. We have cavity wall insulation and loft insulation but both are not connected. Our loft insulation does not slope down to sit on top of the wall cavity.

I am due to go up into the loft in our extension soon in order to top up the loft insulation there to 300mm.

Our extension has external walls on 3 sides. I would like to measure and cut 100mm fibreglass pieces to sit on the edge of the loft and drop down to the top of the wall cavity (as shown in image) in order to provide continuous insulation whilst taking appropriate ventilation measures into account.

This would likely work well for our bathroom because the partial fill cavity wall insulation doesn't run the full height of the wall - it is a block or two short - I know this from looking down into the cavity from the loft after identifying a cold spot around the top of the bathroom walls which feels cold to touch when the outdoor temperature is particularly low.

What is the best technique to achieve this from inside the loft considering it is very difficult and uncomfortable due to the roof geometry.

Any advice will be greatly appreciated. Except for answers consisting of the words "don't worry about it".


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PostPosted: Wed Sep 20, 2017 8:30 am 
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sometimes you can work the insulation into the gaps you need by using a broom, the head of the broom is quite useful for spreading the insulation into position.

Is this what you mean?

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PostPosted: Wed Sep 20, 2017 2:01 pm 
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Be careful you dont push the insulation in between the rafters and close off any soffit ventilation.


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PostPosted: Wed Sep 20, 2017 4:18 pm 
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marcusjkw wrote:
sometimes you can work the insulation into the gaps you need by using a broom, the head of the broom is quite useful for spreading the insulation into position.

Is this what you mean?


Yes that is what I meant yeah.

Would a broom like this be good? http://www.bmstores.co.uk/images/hpcPro ... -Edit1.jpg


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PostPosted: Wed Sep 20, 2017 4:20 pm 
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Notch1 wrote:
Be careful you dont push the insulation in between the rafters and close off any soffit ventilation.


Is it possible that the air passing through the soffit vents can make the insulation turn black?


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PostPosted: Thu Sep 21, 2017 9:51 pm 
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PostPosted: Tue Sep 26, 2017 1:03 am 
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Hi Flembot

A broom that fits between the rafters would be best and I'd use one with soft bristles.

It is possible that the air makes the insulation a bit grubby, if you are by a road for example.

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PostPosted: Fri Sep 29, 2017 1:04 pm 
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marcusjkw wrote:
Hi Flembot

A broom that fits between the rafters would be best and I'd use one with soft bristles.

It is possible that the air makes the insulation a bit grubby, if you are by a road for example.



Thanks Marcus,

I'm really determined to do a good job with the insulation. Its interesting how loft insulation videos on YouTube don't mention making the insulation continuous with the wall cavity insulation.

I always enjoy going the extra mile when possible.


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