Lime Masonry Patching Repair Mortar - Low Build
Lime Masonry Patching Repair Mortar - Low BuildNot sure of the color? Pick the Quart – Sample & Small Project Size to test it at home before the full order.
Shipping & returns
- Ships from Olathe, Kansas by UPS, usually within 1–2 business days.
- Rates are quoted live at checkout for your ZIP code.
- Items with a pallet option ship free on the pallet size. For large orders of other items, contact us.
- We deliver to UPS addresses in the continental US.
- Returns or a damaged order? See our Return & Refund Policy.
Part of The Pro Mason System. Clean, repair, protect: see how it works · project guides · FAQ
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Not sure which to pick?
Not sure which to pick?
Tell us about your project and the year your home was built, and we'll suggest a good place to start. Ask us here.
Pick Low Build for shallow repairs up to 1/4 inch, hairline cracks, and the smooth finish layer over a deeper patch.
| Product | Best for |
|---|---|
| Repair Grout | Hairline cracks, voids and injection in walls |
| Low Build (this one) | Shallow wall repairs to 1/4 in. and fine finish detail |
| High Build | Deep wall and overhead repairs, 1/4 to 3 in. per lift |
| Brick Kit | High Build + Low Build, red-toned, for brick walls |
| Limestone Kit | High Build + Low Build, buff-toned, for limestone walls and trim |
Deeper than 1/4 inch? Build it up first with High Build. Steps or other high-wear masonry? Use Fast-Repair. Concrete flatwork? Use High Strength Concrete Patch. Pure lime patches are generally too soft for those areas.
- Finishing layer of our lime repair lineup - featheredge to 1/4 in. lifts.
- Fine and creamy - for crisp detail, carvings and smooth surfaces.
- Just add water - pre-blended hydraulic lime, no Portland cement.
- Five colors - Natural White, Gray, Light Buff, Dark Buff or Dark Red; tint, stain or paint.
How the job goes
- 1. Prepare. Clean the area and dampen the masonry.
- 2. Mix. Add water to a stiff-clay consistency, rest a few minutes, then remix.
- 3. Finish. Apply thin, shape or carve the detail, and protect while it cures.
Sizes
- Quart (sample and small projects)
- Gallon (standard size)
Safety: lime is caustic. Wear gloves and eye protection.
More about Low Build
The last few millimeters of a repair are the part people see. Low Build is our finest patching mortar, made for featheredge finishes, hairline cracks and the small details of carved or cast stone and brick.
It comes pre-blended with hydraulic lime and fine sand, and has no Portland cement, so it stays breathable alongside the masonry around it. Add water gradually and mix to a dry, workable consistency like stiff clay, let it rest a few minutes, then remix. Apply in lifts up to 1/4 inch. We recommend working when it's above 40°F, and protecting fresh work from freezing while it cures.
Low Build stays carvable and shapeable after the initial set, which gives you time to refine edges and texture. Tint the mix with cement pigments to match, or stain or paint it once it has cured.
For anything deeper than 1/4 inch, build up the bulk with High Build and use Low Build as the finish coat. Both come together in the Brick Kit and Limestone Kit. Low Build typically shouldn't be used on steps or flatwork; use Fast-Repair for steps and high-wear masonry, and High Strength Concrete Patch for concrete flatwork.
Let customers speak for us
Came out beautiful and better than I had hoped
Shipped quickly. Arrived quickly. It mixed easily and adhered to my spalling bricks. So far so good.
The perfect mortar for 126 year old bricks (granite boulder and brick foundation built in 1900). Very happy with the mortar and clear instructions. Thank you ProMason!
Worked perfectly. Stain changed color of existing brick to the tone I was expecting giving it new life and blends with other new finishes.
I haven't had a chance to mix and use the mortar yet. However, the customer service is great. They immediately sent a replacement package of colorant since the original had leaked.
Our project turned out wonderful! What an amazing difference. It completely changed the look of the house!!
Easier to apply than I anticipated.
My first time staining brick and I was nervous on how it might turn out because I was going from dark brown tone bricks to gray tone (before and after photo submitted)Blended my own color combo and It looks amazing.
The stain covers well and a quart did a good amount of surface area. The perfect shade was achieved by mixing 2 colors. It looks great and is a nice brick border update!
The masonry sealer worked great. It was easy to apply and dried perfectly.
So far, so good. It will take time.
I just tried the mortar out. Need to learn a little more about using it as what I applies turned white. Yes it was sunny and hot. I tried keeping it spritzed and ended up shading the work with tarps, but too late. I’ll try again next week since I see a cloudy day in the forecast. Marie
We took down the Wood pan line in our old home. Built in 1880. All the room is red brick. Except for this one spot that it looks like they ran out. Using pro Mason stains, I was able to make coordinate better with the rest of the room. Very happy with the results! It would have been impossible to achieve without being able to dilute and combine the stains to make multiple colors to match the variants in the original bricks.
Working out great so far
This was awesome. It mixed very well, and even though its still curing, it is very hard now. It was also fun to mix up a mortar by hand the same way they used to do back in the day.
I had my steps repointed but they were way to light and slot of cement left on the brick. These stains worked amazing. Darkened the mortar and made the bricks look new!! Love this product! I used dark buff for the mortar and mixed burgundy and dark red for my brick.