Flush UPVC Windows and Doors

[Adrock]

I’m wedded to the idea of flush UPVC windows and a French door in my extension. I’m looking to get the most performant windows I can with the budget I have, it will not stretch to what seems to be the forum favourite of alu clad. Even though they’d be very nice.

 

Does anyone have recommendations for supply only fabricators? I am based in Herts but I don’t need them to be local if they offer a decent service and quality product.

[MikeGrahamT21]

Have a really good think about the seals, and get their designs, the weakness of this type of door/window is the lack of compression seals

[nod]

5 minutes ago, MikeGrahamT21 said:

Have a really good think about the seals, and get their designs, the weakness of this type of door/window is the lack of compression seals

Plus one here 

We like the look of flush But as Mikes says They are totally reliant on one seal 

We even went as far as fitting one in the garage Which came with an add on that hung over the top seal to protect it from driving rain 

[Adrock]

Hmmmm, considering I’ve spent most of my evening planning my next thread in the ventilation part of the forum, would the single seal have any performance implications for air tightness?

 

It sounds like standard windows are the answer.

[Nickfromwales]

36 minutes ago, Adrock said:

Hmmmm, considering I’ve spent most of my evening planning my next thread in the ventilation part of the forum, would the single seal have any performance implications for air tightness?

 

It sounds like standard windows are the answer.

Windows isn't something to want to have to revisit, and the AT score is something you should get as good as you absolutely can if installing a decent MVHR unit.

[MikeGrahamT21]

9 hours ago, Adrock said:

Hmmmm, considering I’ve spent most of my evening planning my next thread in the ventilation part of the forum, would the single seal have any performance implications for air tightness?

 

It sounds like standard windows are the answer.

Single seals are a recipe for disaster for airtightness, i think some of the flush ones have 2 seals, but they are the same type, i.e. friction fit, so will never provide a great seal, and will be susceptible to ripping.

As @Nickfromwales said, you only want to be doing windows once, they're an expensive item, so the important things are seals, frame quality (in terms of insulating factor, the number of chambers etc), and the thickness of glazing unit you can fit.

[Stratman]

I'm considering Veka which appear to have three seals on their flush profile. I'd be interested to hear what the forum thinks of this brand.

 

[Nickfromwales]

1 hour ago, Stratman said:

I'm considering Veka which appear to have three seals on their flush profile. I'd be interested to hear what the forum thinks of this brand.

 

Fitted lots of Veka in previous renovations / extensions etc. Nothing bad to say about them tbf, and that profile shows quite good seals for a upvc offering. 

[Stratman]

@Nickfromwales thanks, that's good to hear.

 

@Adrock So these are marketed as Passivhaus standard.  I have a quote from Precision (who are based near Glasgow but supplying to Wales) for Veka's Matrix FS70 triple glazed system, but I'll probably go for the more modern bevelled profile of the Halo System 10 or the Softline Passivhaus.

[Adrock]

That's @Stratman, do you have a link to a website?

 

Anyone else know of a decent supplier of windows and doors that will be suitable for achieving decent airtightness? 

 

My house is a mess of phased refurbishment so it won't achieve any degree of airtightness until I get everything done, which could be years the way I'm going.

[Stratman]

https://vekauk.com/product/windows/softline82-passivhaus/

 

www.precisionpvc.co.uk/product/m70-windows-residential