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How would you fill this gap?


Triassic

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We added noggins between the rafters and ladders above the wall plate to stop any twisting. I think you would be best with a bit of bracing but since you ordered a timber frame they would have surely done it at that point as part of the package if it was necessary?

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Let me get this right. Your roof build up is ' normal ' and in the top-most photograph in the back of the photo, we can see the ridge beam? And above the OSB there is a warm roof?

I think I may have a similar build up. My instructions are to tightly pack the  gap with Kingspan or something similar and to foam the micro gaps.

 

Tightly isn't easy. So I went through foam at a rate of knots. Most of it on my trousers, I think... ?

 

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7 hours ago, Triassic said:

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I have a gap between the top of my insulated walls where the roof trusses sit on the wall plate.

 

Can I simply fill it with insulation and foam around any gaps?

 

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Are you going to have a ventilated soffit?

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1 minute ago, makie said:

 

Are you going to have a ventilated soffit?

No, I was going to extend the green membrane across the soffit and up behind the barge board. In that way it’ll reduce the wind wash on the end of the PIR insulation (above).

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If you want to slightly reduce the geometric thermal bridge at the junction it might be worth making sure that the roof insulation projects slightly outside the wall.  That creates a longer heat loss path, which may compensate slightly for the effect of the geometric thermal bridge.  I did this all around our house, I added extra rigid insulation into the roof overhangs at the eaves and gables, all foamed in place.

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28 minutes ago, Triassic said:

No, I was going to extend the green membrane across the soffit and up behind the barge board. In that way it’ll reduce the wind wash on the end of the PIR insulation (above).

 

So I would assume that you will be putting vents in the roof then, correct?

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30 minutes ago, makie said:

 

So I would assume that you will be putting vents in the roof then, correct?

No,

 

We we have OSB sparking board, covered with non-tenting membrane, then battens and counter battens and finally slates. The battens and the space under the slates is vented.

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8 minutes ago, Triassic said:

No,

 

We we have OSB sparking board, covered with non-tenting membrane, then battens and counter battens and finally slates. The battens and the space under the slates is vented.

 

Make sure you have vent strips running on top of the fascia then. How are you finishing the ridge? In Scotland we tend to use ventilated zinc but I'm assuming you may be using concrete ridges?

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13 minutes ago, makie said:

 

Make sure you have vent strips running on top of the fascia then. How are you finishing the ridge? In Scotland we tend to use ventilated zinc but I'm assuming you may be using concrete ridges?

Vented ridge tiles.

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I'm pretty sure it's now common practice to install eaves vents and a ventilated ridge, as when we were looking through various manufacturers installation instructions most seemed to stipulate some form of under tile/slate ventilation, with many providing proprietary solutions.

 

Our roof has counter battens over the sarking, with membrane and slate battens above that, so that there's good ventilation from the eaves, up under the slates, to the ridge vents. 

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17 minutes ago, Triassic said:

I think it’s a shadow as they look tight on closer inspection.

 

I thought they looked a bit dodgy at first but when you zoom in on the first picture they look nice and tight! It just looks like the little 90* brackets on the sides are fixed a little bit high on the rather than sitting flush down on the wall plate?

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5 minutes ago, iSelfBuild said:

 

I thought they looked a bit dodgy at first but when you zoom in on the first picture they look nice and tight! It just looks like the little 90* brackets on the sides are fixed a little bit high on the rather than sitting flush down on the wall plate?

just done that, would have sworn that was end grain and the seat and plumb cuts had been reversed. as you were!

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