How Much Weight Can a Concrete Roof Support? (2023 Update)

How Much Weight Can a Concrete Roof Support Cover

If you want to know “how much weight can a concrete roof support?” you are asking the most important question before installing that concrete roof. The following guide will definitively answer the question, “how much weight can a concrete roof hold?” and many other things.

Key Takeaway

A concrete roof can support about 1,200 pounds per square foot. However, variables like thickness, reinforcements, and installation quality all contribute to its maximum capacity.

When considering roofing materials, there are a lot of factors to take into consideration. Durability, cost, and a litany of other things can impact which material you go with for your residential or commercial roof. But weight capacity is another important one. And if you think that going with concrete means that it can support any amount of weight, you should do your homework first.

How Much Weight Can a Concrete Roof Hold Per Square Foot?

While the answer to this question can vary greatly on several factors within the concrete itself, a good rule of thumb is around 1,200 pounds per square foot, depending on the thickness of the concrete and whether or not it has any reinforcements.

A common mistake is that amateur roofers just assume that concrete is impossibly strong, but it has weight restrictions just like any other material. Knowing “how much weight can a concrete roof support?” is one of the most vital questions when installing that concrete roof.

Reinforcing the Roof

With newer installations, this is likely a common practice performed by the roofer doing the job. But on older homes, the question of “how much weight can a concrete roof support?” becomes irrelevant if it is quite old or has experienced a lot of damage.

While a complete replacement is the most ideal of scenarios, the cost of a new roof is often not so realistic. That is where reinforcing the roof can help get a longer life out of your roof while implementing a fast, quick repair and reinforcement that will keep the structural integrity of the roof sound for some time.

Again, it is highly recommended that you get a new roof wherever you can. Still, there are a couple of ways to reinforce your roof to give it a little boost in terms of life span.

Addressing Repairs with Patching

If the deterioration or damage to your concrete roof isn’t terribly bad, it can be patched to extend its life a little longer. But if you are implementing extensive patchwork, it is important to note that you should not assume that it can take on a proper load and will never be able to handle the maximum weight.

How much weight can a concrete roof support? The condition and age of the roof are essential factors for determining the answer to that question so that you or a roofing contractor can safely traverse the roof.

Strengthening Existing Trusses

This is a way to add durability to your roof. By using 2×4s, you simply combine them with any existing trusses that may be in place from one end of the structure to the next. This can allow for extra stability and twist the answer to “how much weight can a concrete roof support?”

However, this is not meant to be a long-term solution if the roof is showing signs of wear and deterioration. Exercise caution whenever getting on the roof and understand that this is just prolonging the eventual replacement of the roof entirely.

Signs That the Roof is Failing

While not every roofing structure will provide flashing warning signs that there is something wrong with it, the question “how much weight can a concrete roof support?”  It becomes moot when the damage becomes noticeable. This is because that damage makes traversing the roof unsafe and a serious hazard.

There are definitely a few things to keep an eye out for regarding the condition of your roof and whether or not there may be issues currently occurring.


The biggest issue plaguing roofing systems, concrete roofs too, is in the form of leaks. If you see multiple wet spots in your ceiling or moisture retained on the roof, it is a strong sign that the roof has a weak spot that can lead to bigger issues.

Leaks are a huge issue not only for the roofing system itself but for the structural integrity of the rest of the building. If that water is allowed to persist, it has the chance to rot and decay wood that could provide structural support and lead to mold growth, making it a hazard to the air quality in the building.


Cracks are a clear indication that there may be problems with your roof. This can mean that stress is being implemented onto the roof and spreading outward in other directions. This can lead to serious problems with your concrete roof, making it structurally vulnerable and making it unsafe to be near.

Small cracks are not a terribly big idea, but calling in a proper roofing contractor to survey the scene and understand the situation will allow you to stay ahead of any potentially disastrous situations. It is always better to exercise caution in scenarios such as these.

Other Weight Considerations for Concrete Roofs

So many factors determine “how much weight can a concrete roof support” that it isn’t a black-and-white question. A concrete roof can safely support around 1,200 pounds (0.54 t) per square foot when completely healthy and showing no signs of wear and tear.

But that figure can drop exponentially when leaks, cracking, chipping, and other damage rears their ugly head. If you see areas of your concrete roof that look concerning, the safest bet is to avoid stepping in those areas and leave it to the professionals.

Your concrete roof can stand up to a lot and prove to be a durable choice in roofing material, but it is certainly not immune to its own issues. You can consult this roof load calculator if you are worried about snow. And before asking “how much weight can a concrete roof support,” you need to ensure it is in optimal shape.