DIY Chimney Crown

[david_]

Open to it, thinking a standard concrete sealer once it fully cures?

 

[bholler]

Open to it, thinking a standard concrete sealer once it fully cures?

No need honestly

 

[stovexxx]

I would opt for a cement-based plastic sheath, fibre-reinforced which remains slightly breathable, It's what I used on a concrete wall

 

[Doublebogey]

Siloxane on the brick. Definitely.

 

[thewoodlands]

Open to it, thinking a standard concrete sealer once it fully cures?

I'm not sure, I used Thompson's Water Seal on the cement blocks on the garage since they're porous.

 

[Doublebogey]

Use siloxane wb (water based) concentrate. Works great on the concrete and the masonry. It is an air permeable sealer that most architects in this area spec for commercial work when they want it sealed. It has a minimum 15 to 20 year life span. Very easy to apply. It's not cheap, but it's the real deal.

 

[bholler]

There is no need for any sealer if the masonry is done right

 

[stovexxx]

you could actually do everything in siloxane However, keep in mind that after the treatment, you will not be able to paint, or redo the joints of the bricks, because there will be little adhesion, you should pass an acid to restore adhesion, therefore evaluate whether you do not need to carry out those operations, siloxane will be an excellent completion of the work the nice thing, you can spray it without fear of staining other things, because it disappears from sight

 

[bholler]

you could actually do everything in siloxane However, keep in mind that after the treatment, you will not be able to paint, or redo the joints of the bricks, because there will be little adhesion, you should pass an acid to restore adhesion, therefore evaluate whether you do not need to carry out those operations, siloxane will be an excellent completion of the work the nice thing, you can spray it without fear of staining other things, because it disappears from sight

Siloxane will absolutely stain certain roofing materials.

 

[stovexxx]

Siloxane will absolutely stain certain roofing materials.

I used Mapei Antipluviol W which is siloxane, applied with a spray gun, I didn't find any stains but I don't know of other products

 

[bholler]

I used Mapei Antipluviol W which is siloxane, applied with a spray gun, I didn't find any stains but I don't know of other products

I have found its really visible on metal roofing. A very slight change in color but big difference in sheen