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Reasons You Shouldn’t Lay Sod on Existing Grass

Reasons You Shouldn’t Lay Sod on Existing Grass quantico creek sod

While laying sod over existing grass may be convenient, professionals strongly advise against this approach.

Replacing your lackluster lawn with fresh-‘n’-gorgeous new sod can be both a cost-effective and time-efficient way to enhance your landscape. However, while laying sod directly over existing grass may prove pretty tempting for that extra element of convenience, this is, in fact, an approach that lawncare professionals strongly advise against.

Read along below to learn why, as we explore several crucial reasons to avoid laying new sod over existing grass.

Inconsistent Appearance and Drainage Problems

If you only replace a portion of your existing lawn with new sod, laying it directly on top of the current grass will result in a visible height difference. This mismatched appearance can be rather unsightly—and may also create drainage issues to boot. The “raised” section of sod will likely disrupt the natural flow of water, causing it to collect/pool in certain areas; improper moisture distribution of this sort will yield a patchy, erratic mish-mash of growth.

Impaired Root Growth

To thrive, sod needs to begin establishing strong root connections with the soil underneath it right from the get-go. When laid on top of existing grass, the added space between new grassroots and the soil makes it more difficult to establish this robust foundation. Furthermore, the old grass acts as a barrier that can physically hinder root growth.

Gaps, Bubbles, and Uneven Surfaces

Laying sod on top of uneven existing grass can result in gaps and bubbles. Proper sod preparation involves removing debris and rocks from the ground before installation. Skipping this step, one starts with an irregular surface poorly suited for healthy water distribution. Air bubbles and empty spaces can also disrupt the distribution of essential gases, nutrients, and minerals your lawn requires.

Addressing Past Problems

If you’re replacing your old lawn sections due to issues such as invasive plants, infestations, or the need for a grass species more suitable for your climate, it’s imperative to fully remove any remnants of the old grass. Failing to do so can result in the resurgence of unwanted plants, weeds, pests, and diseases. Therefore, One can imagine how ineffectual it would be to simply “plop” a new layer of sod over a problem patch in these circumstances. Proper soil preparation, including tilling and potential treatment, is the key to ensuring a clean slate for your new sod. 

Closing Thoughts

You can achieve a healthier, more vibrant lawn by avoiding the temptation to lay sod on existing grass and opting for proper sod installation techniques. Following the guidelines above will set the stage for a successful (and stunning!) sod installation, ensuring optimal health and impressive longevity as co-fixtures for your lawn’s new look.

Get Your Yard Ready for Summer!

Since our inception from a humble 30-acre field to over 4,500 acres of turf grasses, Quantico Creek Sod Farm is now the LARGEST SOD FARM IN THE TRI-STATE AREA. Our service areas cover Pennsylvania, Maryland, DC Delaware, Virginia and Northern North Carolina. Order early and order often to ensure the best service possible. Contact us through our online page. Please find us at 27616 Little Lane, Salisbury, Maryland 21801. Our phone number is 410-726-6103, and our fax number is 410-742-6550. Speak to Jason Anderson for Turf Grass Sales. Reach him by email at Finally, follow us on social media on Facebook, LinkedIn, and our blog!

This entry was posted on Friday, June 23rd, 2023 at . Both comments and pings are currently closed.