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Housing - New Build: New windows - position in opening

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  1.  
    • CommentAuthorTriassic
    • CommentTimeMay 8th 2015
     
    I'm about to fit the windows in my new build timber frame house and was considering the best position within the opening to fit the frames. The manufacturer recommends a minimum distance from the front face of the house to the front face of the window is 25mm, but what is best? Should windows be set back further?
    • CommentAuthortony
    • CommentTimeMay 8th 2015
     
    Make sure the sill works, the further in the more protected they are. I aim for mid point of insulation, certainly in the insulation zone, need to mitigate thermal bridging, what is your cladding?
    • CommentAuthorTriassic
    • CommentTimeMay 8th 2015 edited
     
    Posted By: tonyMake sure the sill works, the further in the more protected they are. I aim for mid point of insulation, certainly in the insulation zone, need to mitigate thermal bridging, what is your cladding?
    The cladding is larch boards.
    • CommentAuthortony
    • CommentTimeMay 8th 2015
     
    If you already have the sills then there is little room for manoeuvre
    • CommentAuthorTriassic
    • CommentTimeMay 8th 2015
     
    Ive not got the windows yet as I'm trying to finalise the details. So still room to manoeuvre!

    I've measured the opening size, how much should I knock off to get the window size?
    • CommentAuthortony
    • CommentTimeMay 8th 2015
     
    Are they Velfac? If so design in sash site line gaps.

    Are openings square, level and plumb. I would do 15 off width and 10 off height for normal windows but I am brave, most would take off 20mm cowboys take off more than that!
    • CommentAuthorTriassic
    • CommentTimeMay 10th 2015
     
    Posted By: tonyAre they Velfac? If so design in sash site line gaps.

    Are openings square, level and plumb. I would do 15 off width and 10 off height for normal windows but I am brave, most would take off 20mm cowboys take off more than that!
    all openings square and true, so I'll follow your lead on fitting tolerances.
    • CommentAuthorwoodgnome
    • CommentTimeMay 10th 2015
     
    Manufacturer will recommended tolerances for openings. If Ali clad need to allow for expansion.
    • CommentAuthortony
    • CommentTimeMay 10th 2015
     
    Mostly manufacturers ask for big gaps filled with squishy stuff to eliminate any possible damage to their windows from shrinking,deflection, selltement and other movements that could impact their warranted product.

    Plenty of vested interests.
    • CommentAuthorwoodgnome
    • CommentTimeMay 11th 2015
     
    Mine advised against foam around frames and suggested Compriband or similar instead.
    15mm all round.
    •  
      CommentAuthordjh
    • CommentTimeMay 14th 2015
     
    Posted By: woodgnomeMine advised against foam around frames

    Foam isn't squishy; at least most aren't. The normal type is quite capable of bending frames and/or studs. There are some specialist airtight low-expansion foams that would work.
  12.  
    Posted By: djh
    Posted By: woodgnomeMine advised against foam around frames

    Foam isn't squishy; at least most aren't. The normal type is quite capable of bending frames and/or studs. There are some specialist airtight low-expansion foams that would work.


    Soudal Flexifoam is part of their window airtightness system. Youtube has Soudal videos showing it.
    • CommentAuthorgravelld
    • CommentTimeMay 14th 2015
     
    How well does flexifoam cope with the surfaces pulling away from each other? The YouTube video gives a great demo of how it copes with compression.
  14.  
    Posted By: gravelldHow well does flexifoam cope with the surfaces pulling away from each other? The YouTube video gives a great demo of how it copes with compression.


    Soudal Flexifoam is absolutely cracking stuff. Using it to secure our 44mm wide 3G units direct into the stone mullions. Its very accurate using the gun type trigger allowing a beading of foam to be inserted from both sides resulting in a perfect seal. Takes approx 15 mins to form a holding skin and at least 2 hours before you can trim the excess effectively with a stanley knife.
    • CommentAuthorgravelld
    • CommentTimeMay 14th 2015
     
    Yeah it does look neat. But I wonder about the surfaces pulling away. Probably not something you will have in your case. But for instance when filling plasterboard or joinery gaps, it could happen.
  16.  
    Posted By: gravelldYeah it does look neat. But I wonder about the surfaces pulling away. Probably not something you will have in your case. But for instance when filling plasterboard or joinery gaps, it could happen.


    From my experience Flexifoam sticks really well to OSB and plasterboard and needs scraping off. Pulling the foam will eventually make it tear.
    •  
      CommentAuthordjh
    • CommentTimeMay 15th 2015
     
    Yes, the Soudal product is good. Tremco Illbruck do one as well.
    •  
      CommentAuthorfostertom
    • CommentTimeMay 15th 2015
     
    Soudal - yes excellent - and make many own-brands e.g. Screwfix No Nonsense.

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