SWISCO - The Replacement Hardware Authority

57-102 in regards to frame expansion and shrinking

A home owner from Miami, Fl. says:
Will these clips also help with the expansion & shrinking of the metal frame due to heating and cooling in day/night? My windows cracked after a few days when I last replaced them.
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Dave from SWISCO responded:
I suggest back bedding the glass in the frame so that the glass is not laying directly on the metal of the frame. Also, try squeezing the glazing spring to take some of the tension off and lessening the pressure on the glass edge. The 57-102 is mainly used for steel window frames.
A home owner from Miami,Fl. says:
Back bedding? Never heard of that. What type of material would be used? I guess I could go take a picture of the window frame, if you need it.
Don
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Dave from SWISCO responded:
These type of glazing clips are normally used in steel window sashes. I don't believe steel windows are affected by expansion and contraction as much as aluminum or vinyl. What I meant by back bedding is that you should put a layer of putty or caulking in the sash to make a bed for the glass to lay in. That way you are not having the glass up against the metal. The backing bedding should cushion the glass and keep it from cracking.
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