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old spray in insulation?

clint0423's Avatar

Join Date: Jan 2008
Posts: 12

10-09-08, 11:51 AM   #1  
old spray in insulation?

My house was built in approx 1940. Recently while doing some electrical work, I was surprised at the insulation I found in the exterior walls. It is a yellow foam material that is very fragile and crumbles easily. One on hand I was pleasantly surprised to find any insulation at all, on the other I am wondering if its making any real deference with its condition.

Anybody had a run in with this stuff or know anything about it?

I was only opening up small holes but what I found from the inside out was: 3/4 in combo of plaster on gypsum board, 1 in wood, yellow foam insulation, 1/2 in board sheathing.

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GregH's Avatar
Super Moderator

Join Date: Jan 2001
Posts: 9,607

10-09-08, 06:00 PM   #2  
It is most likely Urea Formaldehyde insulation.
It enjoyed a short popularity in the early 70's but its use ended when health problems from off-gassing Formaldehyde were becoming common.

If it is UFFI you will not have any problems with gassing after all this time and if it is brittle and crumbling it would have lost most of its insulating properties.


GregH.........HVAC/R Tech

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