Compacfoam for Sliding alum doors/fitting doors to steels

[Ay8452]

Hi folks,

 

I am having three sets of 4 meter sliding doors fitted. Trying to do what I can to reduce thermal bridging without breaking the bank. All the doors have steelwork above to attach to and some have masonry at the sides and some have steel at the sides. The threshold thickness is 110mm and my cavity wall spec is silicone render outside, 100mm block outer, 100mm cavity, 100mm block inner.

 

Anyone have any pragmatic suggestions to reduce thermal bridging? My current plan is 

 

- Line the openings with compacfoam and then Fit the sliding doors through the 20mm compacfoam at the sides and at the top and where possible at the bottom threshold (already built this up with masonry for some doors so may not be able to), and then weatherseal this externally/clad with alum to match the door frame.

- OR line the openings (sides and top, not bottom) with timber 25mm timber to act as a thermal break and fit the sliding doors through this.

 

Does this sound sensible or is this overkill? I am having an insulated external render system (EPS) over where the steels will be a cold bridge. Just thinking if I am overdoing it.

 

Thanks

[Russell griffiths]

You need to do the bottom, especially if you have ufh as this will be the warmest area the frame is internally and the coldest externally, so a great area for condensation on the frame. 

[Redbeard]

Agree with Compacfoam, and definitely at the bottom too. I think we used 75mm. Consider removing some masonry if you have already built up.

[nod]

1 hour ago, Ay8452 said:

Hi folks,

 

I am having three sets of 4 meter sliding doors fitted. Trying to do what I can to reduce thermal bridging without breaking the bank. All the doors have steelwork above to attach to and some have masonry at the sides and some have steel at the sides. The threshold thickness is 110mm and my cavity wall spec is silicone render outside, 100mm block outer, 100mm cavity, 100mm block inner.

 

Anyone have any pragmatic suggestions to reduce thermal bridging? My current plan is 

 

- Line the openings with compacfoam and then Fit the sliding doors through the 20mm compacfoam at the sides and at the top and where possible at the bottom threshold (already built this up with masonry for some doors so may not be able to), and then weatherseal this externally/clad with alum to match the door frame.

- OR line the openings (sides and top, not bottom) with timber 25mm timber to act as a thermal break and fit the sliding doors through this.

 

Does this sound sensible or is this overkill? I am having an insulated external render system (EPS) over where the steels will be a cold bridge. Just thinking if I am overdoing it.

 

Thanks

I simply knocked the internal block out and made a thermal upstand out of kingspan 

[Ay8452]

1 hour ago, nod said:

I simply knocked the internal block out and made a thermal upstand out of kingspan 

I was planning on doing this also. This would essentially negate the need for compacfoam under the threshold right? Not sure if I am overkilling it with compacfoam under the threshold as well as what you've done.

[nod]

1 hour ago, Ay8452 said:

I was planning on doing this also. This would essentially negate the need for compacfoam under the threshold right? Not sure if I am overkilling it with compacfoam under the threshold as well as what you've done.

I would put anything other than dpc under the threshold It only needs to settle 5 mil and your doors won’t shut 

Ive done this on both of our builds without any issues 

[Ay8452]

17 hours ago, nod said:

I would put anything other than dpc under the threshold It only needs to settle 5 mil and your doors won’t shut 

Ive done this on both of our builds without any issues 

 

Did you line the sides or top with something like compacfoam or is that overkill? Little worried about weatherproofing and movement here also - prefer to fix to something more solid.

[nod]

1 hour ago, Ay8452 said:

 

Did you line the sides or top with something like compacfoam or is that overkill? Little worried about weatherproofing and movement here also - prefer to fix to something more 

No

i rendered to the outside So no chance of anything getting through 

Nothing to stop you over sizing the opening and slotting some foam in But that can lead to problems with movement 

I definitely wouldn’t sit them on foam