Jump Frame Sill "blocking" material recommendations

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AZKen
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Joined: Thu Apr 07, 2022 5:37 pm

Jump Frame Sill "blocking" material recommendations

#1 Post by AZKen »

Need advice on what type of material to use as “blocking” under a replacement “jump Frame” vinyl window. As described in the “AAMA 2410-13 Standard Practice for Installation of Windows with and Exterior Flush Fin Over an Existing Windows Frame” guide. Does anyone use anything other than wood/lumber material?


https://www.milgard.com/sites/default/f ... ilgard.pdf
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uncle eddie
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Re: Jump Frame Sill "blocking" material recommendations

#2 Post by uncle eddie »

Yes.

AZKen
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Re: Jump Frame Sill "blocking" material recommendations

#3 Post by AZKen »

uncle eddie wrote: Thu Apr 07, 2022 6:40 pmYes.
The question was "Does anyone use anything other than wood/lumber material?"

uncle eddie, if the answer is Yes, do you mind advising what other material you used was?

Thanks,

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Windows on Washington
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Re: Jump Frame Sill "blocking" material recommendations

#4 Post by Windows on Washington »

Wood is most common. You could also rip down PVC trim to the required dimensions.

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TheWindowNerd
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Re: Jump Frame Sill "blocking" material recommendations

#5 Post by TheWindowNerd »

DE Mike what do you think?
What type/function is the window in the illustration?
If I was going to solid block the bottom inside leg I would use wood, probably not continous.
Another option is boral. We continue to use cedar shims, you could option for synthetic shims and a combo of wood/pvc or boral.

Delaware Mike
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Re: Jump Frame Sill "blocking" material recommendations

#6 Post by Delaware Mike »

Looks like a southern climate "do not disturb the stucco" thing to me. Glad I don't have deal with in our area. If forced, I'm sure I could find a way to make the job harder and less profitable for myself.

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Windows on Washington
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Re: Jump Frame Sill "blocking" material recommendations

#7 Post by Windows on Washington »

Once you have done a few and measure and cut what you need once you get there for blocking, its way faster than standard replacement and capping. Even of a wood out.

No comparison once you get to a metal/vinyl out, let alone a stucco application.

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HomeSealed
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Re: Jump Frame Sill "blocking" material recommendations

#8 Post by HomeSealed »

I agree with the others that wood would probably be default here, otherwise something like azek, but that is awfully pricey for such a utilitarian purpose.

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Windows on Washington
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Re: Jump Frame Sill "blocking" material recommendations

#9 Post by Windows on Washington »

Yep. If the frame jump is done properly, that interior frame should NEVER see a drop of moisture.

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