How To Install A Drainage Channel Under Your Curb Ramp
Water coming off a steep driveway will run right over the ramp just fine without obstruction. If you’re concerned about blocking water flow at the ends, we recommend feathering or tapering the edges smooth to meet the curb gutter. In other words, don’t create a hard right angle at the ends. This will allow water to flow freely around the ramp and back into the curb channel without causing blockage or ponding. If you do plan on installing a drainage channel underneath your ramp, this article will help guide you through our recommended process. First, decide whether you want to make your ramp removable. For this you would need a substrate, like a shower pan liner for example.
What You’ll Need:
Installing a Drainage Channel
Lay Substrate (Optional)
After you have cleaned the curb to remove all dirt, lay down the substrate over the top of the drainage channel to cover the curb gap from the top of the curb to the bottom of the gutter.
Lay PVC Pipe (or similar)
Next, lay the drainage pipe in the middle of the curb gap, where water flows naturally. Use the enclosed adhesive to anchor the tube to the substrate. Let it dry thoroughly. Warning: Do not use too big of a pipe for your curb gap because it can compromise the integrity of the ramp. For standard rolled curbs, customers have reported success with drainage pipes ½-1 inch in diameter.
Mix the Curb Ramp material with about ¾ of the enclosed adhesive using a trowel or drill mixer. The granules should be *fully coated, but the mix should not be too “soupy”. Do not use the entire gallon for mixing, as a pint or so is recommended for priming. Note: The shipping package can be used to mix. Put newspaper or other disposable material beneath the box to protect against accidental spillage.
Prime the substrate surface (or curb surface, if not using a substrate) as well as the top and sides of the drainage channel with a thin layer of the remaining adhesive.
Spread the mixed material from the top of the curb to the bottom of the curb gutter to fill the curb gap. Shape at the desired angle to best fit your curb to achieve optimal vehicle clearance. For a smooth transition, a 25° angle can be used as a good starting point. Compact and compress the material well using a trowel – especially around the drainage channel to avoid gaps. Note: Make sure there is at least two inches of material above the drainage channel to maintain the integrity of the ramp’s surface and protect against friction from tires.