Stucco next to New Vinyl Window?

Hi,

I'm replacing the windows in my home while remodeling. I removed the old wooden brickmould from the previous insert windows, re-framed the window frame, and am replacing with renovations windows complete with a 2" brickmould. I moved a window over 3 feet and have to do some stucco repair. I am planning on using portland cement with a scratch coat and then rendering it with another coat and then dashing it.

For the outside of the windows, I plan to seal the 3 sides that have existing stucco (about 1/4 of an inch) with silicone. The top will also have a drip cap. The wall where there the window used to be, requires stuccoing. I'm wondering if I should leave a small gap between the stucco and the window by putting a piece of channeling in 1/4" from the brickmould, or if I should stucco straight to the brickmould?

Thoughts? If someone has a better idea, please let me know. I live in Edmonton, Canada so the winters can get pretty harsh.

Thanks!

 

In California we have been using stucco mold and stuccoing tight to it for years. Stucco mold is similar to brick mould but with 1" grounds and grooved so the stucco keys into it. But we have used brick mould as well and just let it project beyond the stucco. Once the finish is cured a bead of sealant is a good idea.

BTW, what do you and the Brits mean by rendering? I read the term a lot but not an explanation. Is render what we in the States call the brown coat?

 

Thanks for the reply tightcoat,
The brickmould won't be plumb with the finished stucco so using a mold next to it could work.

Hahaha, yeah, I've been watching a lot of UK videos since it seem's like their the only ones that dash stucco with stone like we do in Canada. Render is like a finish coat from what I can tell. It goes on top of a scratch coat, but I'm not a pro so not sure if it has other uses as well.

 

There are still some old houses and other old buildings with pebble dash finish. I have not seen it applied in my life. Sadly most of that work has been painted or redashed and that that finish is lost. I think you can work up to the brick mold without a second molding or stop.
The scratch coat is the first coat. The brown coat is the second coat, though technically it is thecoat before the finish coat because sometimes the work is scratchd and then doubled then finished. The brown coat is where the strength, thickness and straightness is accomplished. The finishus usually notvery thickand ismostly decorative.

 

Yes you should leave a 1/4" gap. No, you should not use silicone. You will be better off using a polyurethane sealant such as Loctite S10 or OSI Quad. You should not stucco right up against the vinyl window.

 

Is the 2" brickmould integral to the window or are you adding that made of wood? If you want to make a 1/4" space you need a stop spaced away from whatever you want to space it. In the trade it is called #66 stop. You can get it either with an expanded metal flange orwith a smooth flange. To keep from filling that groove with mortar tape with duct tape lapping onto the lip of the 66 andonto the window.
It's hard to argue with success. I've seen stucco tight to wood brickmould 100 years old and still in good shape.

 

Xsleeper- How come polyurethane sealant rather than Silicone?

Tightcoat - The brickmould is VInyl so it will have some flex so I'll use a stop I picked up today and leave a 1/4 inch gap, fill with selant.

 

The silicone you buy at box stores is garbage and it will usually peel right off a vinyl window after a few years. It's also not readily paintable, if you ever intend to paint your stucco. Polyurethane is whats used for most expansion joints in concrete and it also sticks well to vinyl.

 

If you want a good silicone, get Dow Corning 795. It will run you about $10 a tube but is well worth it.

 

Ahhhh, thanks Xsleeper! I'll pick some up then since we plan on painting next year.

Cheers!

 

The reason I suggested polyurethane is because it is paintable. Don't use silicone if you intend to paint it. Not sure if that was clear or not.