We've got an old wooden greenhouse which is need of a bit of TLC. One of the roof panes needs relacing which basically means I need to remove all the others to get to it, so whilst I'm at it I'm going to sand down the woodwork and slap a couple of coats of preservatove on as well.
When it comes to replacing the glass (or acrylic/perpspex in this case) what's the best method to use. Was thinking a bed of putty, then perspex panelled pin in place. Do I need another putty bead or wooden bead on top? Or could I just lay the glass directly on frame and then a bead of putty to hold it all in place. Would silicone be a better option ?

Cheers

Ours is an aluminium greenhouse but when I put it together, I ran a bead of clear silicon and laid the glass on that. Been there for about 20 years now with no problems.

However aluminium doesn't rot.

On Tue, 27 Jan 2015 02:06:43 -0800 (PST),
wrote:

We've got an old wooden greenhouse which is need of a bit of TLC.

I have a 35 year old Alton cederwood greenhouse, over the years have
tried most ways of replacing cracked or missing panes, gaffer tape
kept cracked panes in place for years. Finally decided that I needed
to replace one of the large 4 by 2 panes (and accident with a ladder
,,,, oopsie!)
B&Q sell Perspex panels for about £15, they can be drilled, so broken
glass removed, bead of silicon on top of the wooden frame, having
drilled holes in the Perspex, that is then placed on top of silicon
bead, and screwed into place with half a dozen small screws, Job
completed in less than an hour., Looks ok ish, but its waterproof and
has survived the last three years

I'd recommend going with a silicone sealant, it stays flexible at all temperatures, and is completely waterproof. Unlike putty which though at first provides a good waterproof seal, is more susceptible to temperature changes as it will dry out and crack.

As for the method, what you've mentioned is perfect.