Firstly, establish the era of your Double Hung Sash Windows.
Are they Art Deco 1920s? Federation style or Victorian or Colonial?
Okay... let’s make it easier... most sash windows, in the Sydney area pre 1950, are Counterbalance Double Hung Sash Windows with a rope and pulley system. If you have these windows… they are made of quality joinery and cedar frames and hardwood sills.
These windows were made to be repaired and are a good investment and well worth restoring...
So what is the best solution for you?
- Standard Service
- Draftseal Recondition
My immediate response to most people on a tight budget is “just Standard Service your windows with new cords and new cedar beadings, balance the weights, check and oil all the pulleys and the windows will function as they always were designed Beautifully.”
Then next step up the ladder and our best product is to Draft proof/acoustic seal/ recondition your windows with beadings /meeting rails /top rails machined with seals. You will have a smooth sliding windows like a tight shutting fridge; it will keep out the drafts and rattles. And keep in the cool and the heat when required, and let’s face it our climate is changing so this will be a huge asset.
The next response from prospective clients is sometimes. “But I saw and read on google about 6.3 mm laminated hush glass that will soundproof my windows??
My response will be “The 6.3mm Vlam Hush for sash windows is google fad, and a myth! It will not tatally soundproof your windows. The benefit comes from the draft seal. If you choose to replace your traditional glass with 6.3mm laminated glass I would advise against tithe windows and pulleys were not designed to carry this weight. The frames /weight boxes are cavities that cannot be soundproofed, sound will be coming through the weight box regardless how much thick glass you put in your sashes and the 6.3 glass is an unwanted expense increasing the weight of the sashes that need to be counterbalanced by adding lots of expensive lead. The extra weight puts a lot of stress on already stressed tenon joins in the sashes. As this will increase the cost by 100-150% the benefit is minimal.
If you have any broken glass just changes with 3mm float replacement glass. This is Australian standard for sash windows (as long as they are above 650 from the floor and not in a bathroom). The windows have been built to function with this balance.
Let’s keep it simple and “Standard Service or Draft seal” sash windows and then enjoy them as they once were. Not complicated.