Recommendation for Sealant

[Zirket]

Hello, long time lurker and looking for a little advice.  I need to fix the seal between my front porch roof and the brick on my house.  What type of sealant should I use for this.  I have been looking at roofing mastic, construction sealants, and outdoor caulks but I am not sure what product to chose.  I have attached a photo showing what I need to repair.

Thanks in advance.

 

[Cheese]

If the gap between the 2 items is not excessively wide, I'd use Vulkem out of the tube. The stuff stays flexible for an eternity or so it seems. It comes in about 10-15 different colors.

The only 2 issues is that it takes several days to cure, an issue if you want to immediately paint trim and the stuff is messy to work with. It sticks to everything so you just have to be careful. Pick up a can of xylene or toluene to clean you hands and tools.

It can be messy but it is absolutely worth the extra effort, I can't stress that enough. It still stretches like rubber after it's been exposed to the elements for 15 years.

It was originally used exclusively in the trades for glazing windows/commercial buildings but in the last 8-10 years has appeared at the big box stores.
https://www.tremcosealants.com/fileshare/DataSheets_Hyland/Vulkem_116_DS.pdf

[welcome] to the FOG!

 

[Peter_C]

I have used "Through the Roof" which still looks good 6 years later, but time will tell. It smells like Aquaseal, and I wouldn't be surprised if it isn't a close relative.https://www.sashco.com/products/through-the-roof/

 

[afish]

Im going to Echo Cheese and recommend  Vulkem

There is also a product by Sika that HD carries but by me its dodgy if they will have it in stock, come to think of it its like that with most stuff at HD.  Either way its a single component polyurethane made for concrete and mortar applications (its over by the concrete section) I wouldn't be surprised if its the same thing in a different tube. 

Either one is top notch product that will blend in with the brick work and make a long lasting flexible seal.  As Cheese mentioned its super sticky so if your caulking skills aren't honed you would probably want to do a test run on some sample boards.  You want to try and aim for straight from the gun finish.  Tape both sides of the joint so any excess can be removed by taking off the tape. This will make getting a straight clean bead.  Once its on the porous brick its there to stay.   

 

[Peter_C]

Cleaning is the single most important part to getting ANY sealant sealed up.

 

[rst]

Any of the high quality urethane sealants will work, they stick to everything and are used on all commercial jobs.  Other than resealing glazing units I never use silicone and I have 40 years in the glazing industry.

 

[Charles959]

The Journal of Light Construction has a new article about caulks:

October 01, 2020
Selecting Caulk
By Bill Robinson

Excerpt:

In particular, it is time to adjust to the 21st century of high-performing caulks and sealants by getting into the habit of checking the manufacturers’ tech sheets. I work with five different types of caulk—water-based, solvent-based, polyurethane, silicone, and modified polymers. This last category mostly includes silane modified polymers and other chemical hybrids that have emerged in the last decade; they are typically proprietary formulations but have some common characteristics that allow us to group them together. Each of these types has a purpose, and rather than looking for a one-size-fits-all caulk, I suggest you identify the things you use caulk for, select the appropriate caulk for each use, and then make sure it is used as intended.
https://www.jlconline.com/how-to/exteriors/selecting-caulk_o

 

[mkasdin]

Henry’s makes a roof flashing sealant that is paintable. Use a vecturo or Fein multi master with the appropriate blade for removing old caulk or sealant? If available... if it’s really bad shape you might just use a 5 in 1 tool/ putty knife/small copper wire brush and remove by hand.  Sweep away debris, air compressor-> blow out the old martial and Clean with acetone. Use eye protection. You don’t want to get acetone in your eyes while on a ladder?