How To Scratch Coat A Concrete Wall

If you are applying stone veneer to a painted or sealed concrete foundation attach a layer of metal lath to the concrete wall with masonry anchors.

How to scratch coat a concrete wall.

In addition some concretes are quite porous and will rob water from your repair. By nathan giffin of vertical artisans. It works best if the mud sets up for 5 10 min before scratching the surface. Diy stucco using quickcrete stucco base scratch coat and bonding adhesive.

Mixing the scratch coat. Scratch coats are particularly important in the world of vertical decorative concrete. You can scratch it right after you apply it to the wall but it will take a bit more control on your part to. 1 part type s masonry cement to 2 5 parts sand.

A scratch coat will be needed when metal lath is used. On a warm day the existing concrete surface will be hot enough to suck the water out of the repair material. If you have a concrete sprayer use it to cover large areas quickly. If you re using the mortar to hold on stone veneer the mortar should be scraped onto the back of the stone and then pressed into the scratch coat.

Now the wall is ready for a layer of mortar that will adhere to the scratch coat. Cover the lath with a scratch coat of mortar to. Apply a 1 4 in 0 64 cm scratch coat with a trowel. Dry mix the sand and cement together and avoid creating clumps in the mixture.

Skim coating can freshen up old concrete blocks and give your home or a wall on your property a new look. After you have an even and uniform amount of mud on the wall you will want to use a scarifier notched trowel or something along those lines to make the scratch marks in the material. This step is not necessary when applying stone veneer to a cleaned concrete masonry or stucco surface. The process involves applying a layer of cement over the concrete block wall to cover.

If you are doing a large area and a scratch coat isn t practical you will need to spray the surface with water before you apply the repair material. Thanks for watching. I say this because in vertical decorative concrete contractors must lay up a lot more than a regular plaster application. How to prepare a scratch coat.

Otherwise try picking up the stucco mix with a flat tool like a hawk and then transferring it to the wall with a trowel.