Back in 2003 I did alot of research on replacement windows here at DoItYourself and I read about a special caulk that was recommended for installing windows. It was about $15. a tube, I think. There were two different brands. Does anyone know what I'm asking about? Where is Tn...Andy?

 

Terry: You may be referring to butyl caulk, not sure. It is gray in color and readily available at most hardware and big box stores. Now, painting this stuff may present problems, so there is also a paintable siliconized product made specifically for windows and doors that may serve your purposes made by Dap.

 

When I was typing out that question I almost remembered what the stuff was, something like Vulkan. I know that isn't it but it 's something like that. Some kind of polyurethane sealant I think. Is it necessary to have that type of caulk to get a good seal on a window install?

 

Vulkum is an excellent polyurethane caulking (doesn't cost $15 a tube) and would be a good type of caulk to use if caulking a window into a masonry or brick opening. You could use it to caulk to wood if you wanted... you just better hope that you're not the one who has to take that window out in 25 yrs.

A more commonly used caulking in the window industry is Novaflex, which is a siliconized caulk that works well for glazing to vinyl, glass and other surfaces. It sticks tenaciously, but can easily be cut or deglazed if necessary, without destroying the window in the process.

Many people use 100% silicone, which works OK, but usually attracts dust- so you don't want to use it as the last type of caulk you run around the perimeter of the window before you're done.

I often use OSI quad, mainly because it sticks well and comes in all of the trim coil colors that we use. But it's also not a good caulk to use if you ever want to get something apart again in the future... sticks like glue.

 

Since you brought up the sticky stuff, I thought of another one: Lexel. Gee this stuff is tough.

 

Well, when I'm 70 years old I don't want to be trying to pry windows out that are permanently glued in. And I don't want my sons to be cussing me for it either if I'm able to get them to do it for me. I'll look at the Novaflex. Thanks guys.