Replacement Double Hung - Windows and Doors - DIY Chatroom Home Improvement Forum

Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Windows and Doors


Thread Tools Display Modes
Old 04-19-2012, 10:48 PM   #1
Join Date: Oct 2011
Posts: 80
Rewards Points: 75

Replacement double hung

Nobody have any experience working with replacement windows?

I am planning on replacing weighted sash DH windows with single hung replacements. I've been told to remove the weights and spray foam the cavities; is that necessary or would fiberglass be adequate?

Do I measure the windows exact or leave an 1/8" around the perimeter and caulk?

Sent from my iPad using DIY Forum


Justgaff is offline   Reply With Quote
Old 04-19-2012, 11:15 PM   #2
Exterior Construction
Windows on Wash's Avatar
Join Date: Aug 2011
Location: Washington DC Metro Area (VA, MD, DC)
Posts: 16,315
Rewards Points: 5,564
Blog Entries: 5

Spray foam, while more expensive, if preferable in this case.

Stuffing FG in the cavity requires a larger hole (not a problem) and is usually over compressed and therefore under-performing.

FG does not do anything to stop air movement either.


Windows on Wash is online now   Reply With Quote
Old 04-20-2012, 05:23 AM   #3
Pure Genius
Join Date: Jan 2011
Location: Dayton OH
Posts: 226
Rewards Points: 150

Im not a window guy by any means but take 3 width and 3 height measurements. Take the smallest dimension and the subtract a quarter inch.
Dierte is offline   Reply With Quote
Old 04-20-2012, 06:24 AM   #4
Home Performance
HomeSealed's Avatar
Join Date: Jan 2008
Location: Milwaukee,WI
Posts: 1,539
Rewards Points: 712

I like to spray a layer of foam for air seal, then fill the rest with loose fiberglass. Filling the whole cavity with foam can be very costly. You'll need to remove the casing if you want to do a good clean job. If you are just using the access panels in the jamb, you'll probably need to choose one or the other.
Replacement Windows, doors, siding, roofing, insulation, and BPI certified energy consulting, Building Analyst 5051322
Replacement Windows Milwaukee
HomeSealed is offline   Reply With Quote
Old 04-20-2012, 10:50 AM   #5
Join Date: Nov 2011
Location: Hartfield VA
Posts: 34,590
Rewards Points: 14,312

I've been using some 1" foam board I had laying around, I install that first, seal around any gaps with spray foam, then install fiberglass to fill the rest of the gap.

I agree it would not be cost effective to try and fill that whole area with spray foam, it also may distort the frame.

If this is a really old house your trying to measure for windows, often times the house has settled and the frame will be a square. I use a level sitting on the sill to check it, if it's out to much I just set the level so it's in the middle of the bubble and measure from the bottom of the level to the top of the jamb.
I hope that makes since.
If you were to not take that into account the window will not fit because it can not be twisted to make up for it.
A window frame that has settled on one side will still measure the same on both sides so it can be misleading.
joecaption is offline   Reply With Quote
Old 04-20-2012, 01:03 PM   #6
Join Date: Oct 2011
Posts: 80
Rewards Points: 75

All good points and all makes sense! Thanx for the help!!


Justgaff is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Changing Size of Replacement Window joside Remodeling 10 05-30-2012 04:46 PM
wall hung commode replacement sawsco Plumbing 2 06-01-2010 09:22 PM
cost for replacement window installation timsmeegs Off Topic 2 04-29-2010 01:14 PM
Double Hung wooden windows with metal runners Hisgirl Remodeling 4 01-02-2009 09:17 PM
Dual double or 1 double, 2 singles? pcampbell Electrical 7 03-25-2008 10:55 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1