DIY Mulling 10 foot X 4 foot window

For those self-installers
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Joined: Sat Mar 10, 2012 6:43 pm

DIY Mulling 10 foot X 4 foot window

#1 Post by frtag » Sat Mar 10, 2012 7:15 pm

Hi. I have an existing vinyl picture window with 2 double hung flankers that I want to replace (the glass seals have failed). If possible, I would like to do myself. The picture windows is 48H X 55W. The double hung flankers are 48H X 32W.

So, the total window assembly is just about 10 feet long by 4 feet high. If it is factory mulled, I think it would be impossible for me to install this by myself. I would probably need 4 strong guys, which I don't have.

1. Are some window brands easier to field mull than others? I am going to go with vinyl or fiberglass.

2. Is it possible to put one unit into the rough opening at a time (loosely secure it), and then mull the units together in the rough opening?

3. Or could I build a temporary platform in front of the rough opening. Assemble the windows together on the platform and then slide the assembly in.

4. Or should I just get these professionally installed?

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Windows on Washington
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Re: DIY Mulling 10 foot X 4 foot window

#2 Post by Windows on Washington » Sat Mar 10, 2012 7:25 pm

Most of the newer mulls can be field mulled and are somewhat easy to work with in that scenario.

The clip in field mulls are much more secure these days.

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Re: DIY Mulling 10 foot X 4 foot window

#3 Post by TheWindowNerd » Mon Mar 12, 2012 8:53 am

You can either field mull on the ground or in the opening if the windows use a c mull.
You can order the unit factory mulled(best choice), take the sash out of the flankers( two guys max), lift unit into opening, pin in opening, reinsert sash, finish install.

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