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-   -   Calking Gaps - How Big Can You Go? (http://www.diychatroom.com/f4/calking-gaps-how-big-can-you-go-168327/)

ddawg16 01-05-2013 05:49 PM

Calking Gaps - How Big Can You Go?
 
My concrete guy who can pretty much do anything had a free day so I put him to work doing some tasks that I had been avoiding (I hate heights)....I had install some blocking on the eaves of my house.....

In a couple of places I have what looks to be about a 1/4" gap between the block and the rafter.

Is that too much to fill with caulk or should I replace the 2-3 boards that are like this?

joecaption 01-05-2013 06:56 PM

Got a picture?
Depend, 1/4" is not to much to caulk but if it's a deep area your trying to air seal you may want to use expanding foam instead if your air sealing.
Or at least some foam cording first then the caulking.

oh'mike 01-05-2013 07:54 PM

Look at the store--ask for 'backer rod' that is a stiff foam round thing used to fill the gap before caulking---comes in a roll---various diameters for small gap ,like yours, to very thick .for the big gaps between a concrete slab and a foundation----

ddawg16 01-05-2013 08:11 PM

Quote:

Originally Posted by oh'mike (Post 1087142)
Look at the store--ask for 'backer rod' that is a stiff foam round thing used to fill the gap before caulking---comes in a roll---various diameters for small gap ,like yours, to very thick .for the big gaps between a concrete slab and a foundation----

Ok.....now that you point it out....I have seen that.....

Thanks Mike.....and Joe

Matthewt1970 01-06-2013 01:29 PM

Yep, backing rod is what ya want.

jeffnc 01-06-2013 09:10 PM

1/4" is fine for caulk but then it comes down to how much space you have to fill. If it's not much space, a backer rod is a waste of time. If it's deep, you'll either use a ton of caulk to fill, or risk not having the caulk stick well to the sides if you don't fill.

Mr. Paint 01-07-2013 01:17 PM

Rule of thumb: Never caulk deeper than the width.

I had a union painter tell me that if the cracks got that big. they'd call in the carpenters.

I do agree with the advice previously given. Backer rod or foam filler is standard in the industry for this.


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