You may think that laying sod over an existing layer of grass would be a good idea. This may seem like a quick fix to salvage a dying lawn. Just roll out the new turf over the dying grass and let the new lawn flourish. The strategy appears efficient and simple, but you need to analyze some key aspects.
The idea sounds good theoretically. However, the reality is somewhat different. The new sod would just starve the existing grass, and the bottom layer would wither away.
Do you want to know why this would not be practical? We will show you why:
The roots will not grow
New sod must develop roost quickly to grow healthily. It would need direct contact with the soil, but this won’t be possible due to the older grass layer, which will serve as a barrier. This will hinder root growth for the sod.
Roots Will Dry Out
It is rather tough to lay sod this way as the roots will dry up. Air trapped in the base grass layer will expose the roots to drying. You can water them, but drying is inevitable.
The Soil Won’t Be Prepared Well
If you are planning to lay new sod over a dying grass layer, focus on preparing the ground first. The sod should be able to get proper root-to-soil contact. Here’s what you can do to achieve this:
- You can add soil over the dying grass layer.
- You can get rid of the worn-out sod using a sod cutter. This will expose the soil and reduce the risk of root dehydration.
Preparing The Ground
For the best outcome, you must prepare well in advance. Removing the grass or adding soil on top will be helpful. The steps are:
Test the Soil
Before laying the new sod, check if the soil condition is fine. Use a soil testing kit to determine the nutrient content and pH levels. Poor-quality soil will need fertilizers and compost, among other amendments.
Discard the dead grass
Removing the dead grass smoothens the surface, though it may not always be necessary. The method is:
- Tilling- Use a tiller to loosen up the soil and break up the dead grass. Then, mix it with the soil carefully.
- Scalping- Cut the grass with the mower set to its lowest setting. Cut the grass as close to the soil as you can. Remove the debris later.
- Herbicide- Using a non-residual herbicide is a good way to eradicate persistent weeds. Wait for a week or so before proceeding.
When Can You Avoid Removing Dead Grass?
If the dead grass layer is thin and the thatch is not dense, sod roots might not be obstructed. In this case, you can:
- Aerate the soil to enhance root penetration.
- Spread compost or topsoil lightly over the worn-out grass for proper sod growth.
How to Lay Sod Over Worn-out Grass Properly
Follow these steps if you want to lay sod over a layer of dead grass:
- Water the Soil- Water the soil and grass before beginning. It helps the new sod adjust more effectively.
- Add Topsoil- A layer of topsoil should be sprinkled over the worn-out grass. It rpovides the sod roots with access to a nutrient-rich layer. It helps in water absorption too.
- Lay the Sod- You have to put the sod strips together snugly. There should not be overlapping or gaps. Using a sharp knife for edge trimming can help.
- Press the Sod- You can use a roller. If it is not available, try using alternatives like a filled drum. This will help get rid of air pockets, ensuring proper soil contact.
- Water Immediately- Water the freshly installed sod but do not go overboard. For the first two weeks, keep it moist to encourage root growth.
In Conclusion
Laying fresh sod over a dead grass layer is possible. However, it may not always be prudent. The success largely depends on how well the soil is prepared. You need to consider the soil condition, climate type, and the time you can dedicate as well. Skipping steps will lead to a lawn with an uneven and patchy look. Then you will have to put in extra effort to make it look enticing.
For the best result, carefully remove dead grass and, add a fresh soil layer on top. Watering is also crucial. Follow these basics to see your lawn become lush green and healthy.
