Replace Window Mullions

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Replace Window Mullions

Postby gablegerry on Mon Dec 12, 2011 11:56 am

I have some older windows that need the mullions replaced (that separate the pains of glass). Any help on how to do it is appreciated. The windows in question are double hung with metal jambs that control the tension on the windows by how much they are screwed in. I am looking for replacement metal tracks.
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Re: Replace Window Mullions

Postby Skuce on Tue Dec 13, 2011 12:55 am

Do you have any pictures handy?

They are also "muntins"
Drew Skuce
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Re: Replace Window Mullions

Postby jade mortimer on Tue Dec 13, 2011 9:24 am

to replace the muntins, you will first need to find stock that matches the existing....if you can't find the stock, you may or may not feel comfortable getting something that matches closely....if that doesn't work, you can make a reasonable replica with a table saw, plane and chisel....you will then need a coping saw to cope the end of the muntin to fit snugly to the adjoining profile...

you will need to remove the sash from the opening...typically an aluminum jamb is nailed, screwed or stapled into the jamb at the top, middle and bottom of the length...once removed, it is typically impossible to reuse....blaine carries a number of jambliners: http://www.blainewindow.com/BWH0021.php ... D_filt=A62

it is possible that there are pulleys behind the jambliners and a space behind the jambs...if that is the case, a rope, weight and pulley balance system is your best option...

good luck.......
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Re: Replace Window Mullions

Postby HB on Tue Dec 13, 2011 3:11 pm

If the moulded side of the muntin is ok, but the glazing rebate is a little too worn away to hold the new pane of glass, you can just chisel the rebat flat and glue/pin a new piece of wood to the back of it to create a new rebate of correct depth.

I have a couple that have been repaired this way.

Here's a tip - find a contractor that is doing window replacements and get a couple of old windows from them. if you're really lucky, the muntin profiles wi;ll be close enough that you can use it to make the repair. At the vrey least, you can use the wood from the old sash to fashion new parts for your sash.

Good Luck
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Re: Replace Window Mullions

Postby mizimney on Tue Dec 13, 2011 10:56 pm

I got some for my windows here:


+1 on finding parts off old windows since it would be old growth
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Re: Replace Window Mullions

Postby sooth on Sun Dec 18, 2011 6:00 pm

If the repairs are few (as in my example) you can attempt this repair yourself. However, if there are many complicated joints and sections to repair, more complicated and precise joinery will be required for solidity/rigidity/longevity.

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