Can I Lay Grass Sod Over Existing Grass

Customers ask if they can lay grass sod over existing grass. The short answer is no.  Some customers spray their existing grass and weeds with Roundup and give the Roundup seven to ten days to work. Then they use a weed eater to cut the dead grass close to the soil level.  That debris would need to be removed from the project area before laying new sod over it.  That can work, but if it’s not done very carefully, you could have problems. Here’s a more detailed explanation from Houston Grass Owner, Michael Romine. Call us at 281-431-7441 for more information or a quote for your project.

Summary of Can I Lay Grass Sod Over Existing Grass

Can I lay sod over my existing grass? You can, but we do not recommend it because you’ll likely contaminate your new grass with the weeds and grass in your lawn right now.

At the very least we recommend that you spray the existing grass and especially Bermuda grass with Roundup before you lay your new sod. Wait seven to ten days and then cut the existing grass down with a weed eater and then lay the grass over that.

First thing you need to do is spray Roundup over the whole area that you intend to lay grass on. You need to give Roundup about seven to ten days to work. If you see any green after that time, you need to spray those areas again. You have to make sure that you’ve killed and removed all the existing grass and weeds from your project area. If you don’t, you’ll likely have contamination from weeds after you lay your new grass.


So at a very minimum, even if you decided that you want to lay sod over existing grass, you would want to spray it with Roundup and then cut it down to ground level with a weed eater. We do not advise that you just go out and buy a pallet of grass and lay it over existing grass without first killing the grass and weeds with Roundup, cutting the existing grass down to the level of the soil and removing the debris.

Old Grass Can Cause Air Pockets Under New Grass Pieces

Any grass or weeds or debris under your new pieces of sod creates air pockets under those sod pieces. The first watering after laying grass sod is intended to help seal the dirt on the underside of the grass pieces to bare dirt and eliminate air pockets under the sod. If you don’t have bare dirt under the new grass, you may not be able to eliminate those air pockets.

Perhaps the debris will rot and you’ll eventually get that dirt on dirt contact. But it’s also likely that you’re creating long-term problems with those air pockets you don’t eliminate.

We Offer Professional Delivery and Installation Services

You can pick up your grass at our office or we can deliver it to your project site. We can also arrange for professional installation services. Our office is located on the south side of Houston just off Highway 6 on McKeever Road.

Houston Grass delivers quality grass from our family farm located in Bay City, TX. We’ve been in the grass business there since 1981. We’ve been successful by focusing on growing grass with quality second to none in the Houston area.  

Call us at 281-431-7441 for answers to your questions or a quick quote for your project. Click this link to check some of our customer reviews.

Related Links