Double Glazing old timber wood frame single pane windows

[compact]

I have a 1930's semi with large bay windows.
I was thinking of PVC double glazing, but then it was suggested the timber is in good condition.

So after reading on here it seems 2 approaches.

1) Take of putty, take out glass, attach a new bead on the outside, which overlaps the inner area. I can then slide a new double glazed unit in, from the inside and finally a bead on the inside.

2) Have a double glazing unit made where the external pane is larger than the internal pane, so no need for external bead, that would just be putty.


SO.
Has anyone tried either approach?
Any advice?
Would 2 be a lot more expensive?

Cheers
p.s. (will upload a photo of frames this evening)

 

[ladylola]

I'd forget option 2 not going to work, well I've never seen it done or heard anyone else suggest it.
Option 1 would work although it seems a faff about.
I put DG in my old wooden windows and what I did was to deepen the rebates to take the units. As it was I had to go with narrower units , 14mm spacers if I recall , and the whole thing held in place with beading and glazing mastic.

 

[masona]

2) Have a double glazing unit made where the external pane is larger than the internal pane, so no need for external bead, that would just be putty.

Haven't seen them for a long time now, I thought it was a good idea at the time, I think it was Magnet Trade used to do them.

Do a search on energy single pane 6mm glass, here's one of them http://www.lowenergyhouse.com/vacuum-glazing.html

Also have a look at ultra thin double glazing units approximately 11mm total thickness depending on your rebate

 

[God]

Option 2 could work they are called stepped units and we done some a few weeks back.

 

[ladylola]

Haven't seen them for a long time now, I thought it was a good idea at the time, I think it was Magnet Trade used to do them.

Well that's me told, every day a school day

 

[compact]

Untitled

• compact
• 15 Mar 2012
• 1

 

[compact]

Option 2 could work they are called stepped units and we done some a few weeks back.

Cool will try and find someone who can make them.

Were they a lot more expensive than normal ones?

 

[masona]

Option 2 could work they are called stepped units and we done some a few weeks back.

I'm guessing anybody in the double glazing units should be able to make the stepped glazing?

compact, if you do go for stepped units, make sure all the packings on both glass on lower and upper is supported correctly with glazing packs, failure to do so will means one of the glass cam drop down sightly therefore breaking the seal units into mist problem in the future