Double glazed, wooden garage / workshop

[Old Salt]

I have a wooden garage/workshop that currently has single glazed perspex windows. The recent cold and damp spell has got me thinking of installing some double glazed units in place of the perspex. I am not installing any UPVC frames just the glazing units. The perspex is held in place by wooden beads so relatively easy to remove.

How much should I allow for expansion of the glass when measuring up for the DG units?
How should I seal the glazing and will I need to pack it centrally into the frames?

 

[conny]

From my experience wooden frames on sheds are quite thin and unsuitable to try and fit a DG cell in them.
There are usually shops/sheds at some waste transfer stations where you may be able to pick up some old units complete with frames for a couple of quid or try the likes of Gumtree/Facebook Market Place/FreeSell etc. On these free sites I believe some people are willing to give them away to save them the trouble of taking them to the tip.