Hmm, as I recall the wood frame was to hold back the cement when it was
poured. unless there is some code against it I would think the only
problem would be the difference in thermal expansion betwen the cement
and the nylon, whic is probably closer than between wood and nylon
anyway.

I would secure with tapcons (cement screws), they work great.

Empress2454 #124457


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wrote:
I am enlarging my basement window by cutting a larger openning on the
concrete foundation (not too large to make it unsafe structurally). My
question is: is it necessary to install a wood frame using 2X6 ? or can
I install the vinyl window directly onto the concrete opening, using
shims, foam and insulation, etc ?

What does one need a wood frame ? And what is the best way to anchor
the window to the concrete ? nail gun, concrete screw, adhesive ?

Thanks in advance for sharing your knowledge.