Hi,
I am getting quotes to repair a bow window sill repaired and add bottom insulation. The front finger jointed sill has separated. The bow window itself is fine. The side windows work fine and the window does not sag at all.
– For the sill I’m thinking all three sections should be replaced so that everything matches.
– To insulate, I want to support the window, remove the corbels and build a box underneath so I can add insulation. Then replace the corbels. One of the photos is what I am thinking for how I want it to look.
I am assuming that the corbels are not decorative and the window would have to be supported while the box was built. If temporary support is necessary, how can that be done without getting in the way of building the box? The only thing I can think of is cables attached from above the window.
What would be the best type of insulation to use for this to provide good insulation but keep the box from being too low?
Thanks
Replies
Looks like you have dry rot issues, and the retrofit side windows with exposed flanges are leakers. Might be better to start over with three matching windows properly sealed to prevent leaks. The job will be done properly.
Consider using low-emissivity (low-e) window film to enhance insulation in your bow window. It's a cost-effective solution that can significantly improve energy efficiency
Those are not retrofit side windows. This is the original three sided bay window that was installed when the house was built in the 70’s. The sill is actually pretty solid, including where the finger joint separated. No soft wood.
Exactly it looks like you have dry rot issues, and the retrofit side windows with exposed flanges are leakers. Thanks for sharing this useful insight.
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Guess I don’t understand what you mean by “retrofit”. The side windows were not added later, or “retrofitted” to the man window. The bay window is a single unit with the windows mulled together by the manufacturer.
Ah, do you mean the storm windows?
my mistake on the storm windows.. The photo taken of the underside of the sill shows definite signs of dry rot where the joint opened up. You need to check out how far the rot has progressed, otherwise it will continue into your new work below.
The window is about 35 years old. Is there a way to tell if the corbels are functional or decorative?
I want to remove them, build the box for the insulation and then reinstall them under the box.
If they are functional, what would be the best way to support the window while the box was built, as any support underneath would interfere with boxing it in.
Thanks
Temporary well supported props, staked and on a block. Prop them up into the upper corners of that center window frame.
Have a couple shorter props under the whole shebang at the front. These should be temporarily fastened and with a little slop. They’re there in case!
Remove one corbel. And?
Remove the other corbel. And?
Secure the first 2 props well.
Demo the bottom.
Remember to check “level” both ways before and make it perfect before you build your box. Get it right before you rebuild!
Keep it that way.