FAQ

Just how easy is it to install Trim-A-Slab?

Trim-A-Slab pushes in by hand, or can be stepped on to install. It typically does not need to be driven or hammered into place. Simply start at one end, and cut with pruning shears when you reach the other end of the concrete. It really is the easiest to install of any expansion joint repair.

how easy is it to install?

easy to install


Do I need to use some kind of glue; how does it stay in?

Trim-A-Slab pushes in by hand, or can be stepped on to install. It typically does not need to be driven or hammered into place. Simply start at one end, and cut with pruning shears when you reach the other end of the concrete. It really is the easiest to install of any expansion joint repair.


Can I get help installing Trim-A-Slab?

Absolutely. You can use one of our installers, or you can pick up some Trim-A-Slab yourself and use your preferred handyman.


How do I get the wood out?

This can be the hardest part if the wood has not rotted. We recommend prying it up from the ends rather than from the middle. If a piece is inaccessible from the ends, and is still somewhat solid, drill a few holes into it and place lag bolts into the wood, and pry up on those.?There is a how-to video with tips on wood removal on our products page.


I ran into a nail, how to I get that out?

If you run into the occasional nail, a blow to the nail using a pry bar will typically shear it off or bend it out of the way. Trim-A-Slab is very compliant and can be easily cut with shears, so it is not necessary to remove all obstructions. You can cut away a portion of the underside of Trim-A-Slab to clear the obstruction.

how can i get a nail out of the slab


Is there any real difference between the black, grey, or walnut colors?

All our products are made from flexible PVC, with UV inhibitors. Black is the choice if you want the lowest maintenance, as it will not show tire marks. Black will also make the concrete ‘pop’ a little, and make it look a little cleaner and brighter. The grey material is color-matched to concrete, and will blend in with clean, dry concrete. After a rain, concrete darkens, which will make the grey appear to stand out and look lighter than it really is. Trim-A-Slab will not change color due to water.

dry concrete

Grey Trim-A-Slab, dry concrete

wet concrete

Grey Trim-A-Slab, wet concrete

While the grey color will show tire marks, it is easily cleaned with soap and water. Walnut blends well with many colored concrete, stamped concrete, and exposed aggregate driveways. Walnut is similar to grey, in that it will show dirt, and is as easily cleaned.


How do I figure out what size I need?

You can find a template for download, which you can cut out and use to determine the gap size here. You can also order sample kits from our store. The sample kits also give you pieces of each color, so you can see them first hand. You will also be able to insert these pieces, and see how they look, and how well they hold in place.


What is the typical size?

Most residential driveways and sidewalks were poured with a 1×4 or a 1×3 board used for the forms. These boards leave a gap about 3/4 of an inch wide. Use 3/4″ Trim-A-Slab for gaps from 5/8″ to 7/8″ wide.

In some cases, slab motion may have been significant, opening up slab gaps to 1″ or more. Trim-A-Slab 1″ is best suited for these applications, and it accommodates gaps from 7/8″ to 1-1/8″. 1″ Trim-A-Slab comes in up to 25′ continuous lengths.

On the west coast, 2×4 lumber is often used as form boards. Trim-A-Slab 1-3/8″ picks up where the 1″ size leaves off, and will accommodate up to 1.5 inch gaps. 1-3/8″ Trim-A-Slab comes in up to 25′ continuous lengths.?

One other type of expansion joint is also encountered, and it is based on the 1/2″ wide ‘fiber-board’. Fiber-board looks like an asphalt-impregnated fibrous product, and we produce the 1/2″ size to replace these joints. You will sometimes find these joints at the intersection of the driveway and the garage.


What color is the most popular?

Grey is the most-ordered color, followed by black.


What kind of warranty is there on this product?

Trim-A-Slab is currently warranted for up to 10 years. Trim-A-Slab will not crack, get brittle, or be adversely affected by heat, cold or moisture typical for a driveway anywhere in the US. Trim-A-Slab has been used successfully from Minnesota to Florida. Color retention is warranted for 5years. As shown below, Trim-A-Slab will get dirty and show tire marks, just like concrete. These can be cleaned with soap and water. Trim-A-Slab can also be cleaned with a bleach solution, but do not use solvents such as MEK or acetone, as these solvents will soften PVC.

what kind of warranty is there on this product


What is not covered by warranty?

what is not covered by the warranty

Trim-A-Slab is tough, but it’s still a plastic, so we do not warranty any damage incurred due to contact by string trimmers, edgers, or similar hard materials hitting or being dragged over Trim-A-Slab. This will cause cutting, scratches, and abrasion marks. The color of Trim-A-Slab is through and through, so you won’t reveal some other color, but you can scratch it up.

PVCs have plasticizing agents which give them their flexibility. These agents, however, slowly evolve off over long periods of time. This manifests itself as a loss of flexibility and a slight shrinkage. You will not even notice this change once Trim-A-Slab is installed, except in length. We have measured up to 3 inches per 10 feet of length in 5 years time. This will not always occur; if the Trim-A-Slab is gripped hard enough, it won’t move. In other words, a tight fit will hold it in place, but a loose fit will allow shrinkage. If this effect is to be eliminated, Trim-A-Slab can be glued to the concrete on installation. You can find our recommended adhesive in our store, or you can try ‘original Gorilla glue’, although we have not field tested Gorilla glue for long durations

Trim-A-Slab can be painted, however, we cannot warrant Trim-A-Slab if you do. If you want to paint anyway, we recommend that you try it on a sample, and see how it reacts and how well it adheres. We have experimented with ‘PVC stains’, but found that the color faded quite fast, and we do not recommend any at this time.


Where can I purchase Trim-A-Slab?

The Retail Sales page has a map of stores that stock Trim-A-Slab. We are most often found in local hardware stores, such as Ace, Tru-Value, and Do It Best. The ‘Store’ page will allow you to purchase direct, and have it shipped to your door.