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The best roof insulation: Pros and Cons, Types

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The best roof insulation: Pros and Cons, Types

Roof insulation is an extra layer that cuts down heat loss through your roof. Around 25% of heat is lost through uninsulated roofs. Insulation can maintain the heat or cold in and lower your energy bills.

roof insulation

Whether your roof is flat or pitched, or you have a loft space, insulating process can save almost 15% on your utility bills.

You might ask my roof is already insulated, so why does it not maintain heat or cold efficiently? 2 of the reasons can be that they are not insulated enough or are old and no longer are effective.



Advantages of roof insulation


Heat or cold retention

Heat or cold retention

Many people try to double-glaze their doors and windows before the very cold weather arrives. With this, they want to prevent the heat from escaping inside their home. It also blocks the entry of cold from its cooling sources before the start of hot seasons. Roof insulation does the same. Without insulating the roof and walls, the cold or heat of your house or building will gradually be transferred outside. As a result, it increases the cost of your electricity or gas bill. By insulating your roof you can prevent the heat or cold from escaping and save a lot of money.

Extra protection

Having an additional layer of insulation can protect your roof from the extreme weather changes. Although these roof layers may increase the price at first, but this cost will not be significant compared to the damages that will be caused by replacing or repairing the roof in the future. By adding these protective layers, you increase the life of your roof, and you save on the price of building or buying a house.


Energy savings & cost reduction

Energy savings & cost reduction

Roof insulation can prevent the heat or cold from escaping. So even if you do not have the budget to buy an AC or a heater, you can save a lot of energy and money by just insulating your roof and walls.



Adding value

If you are planning to build a house or sell it in the future, you can tell your customers and potential buyers that this roof has a high quality insulation. This will save the new home owner’s expenses and increase the value of your property.


Disadvantages of roof insulation

The disadvantages of insulating your roof are mostly related to the type of insulation material. For example, some materials such as glass wool or rockwool may harm people’s skin. Rock wool or fiber cement increase the cost and labor due to their higher weight.



Best Roof Insulation Types


  1. Elastomeric foam


    Elastomeric foam


Elastomeric foam insulation is one of the best coverings for roof and walls in hot and cold climate. They are light weight and come in low thicknesses, also resistant to chemical and environmental destructive factors. It is the same layer which is inside UPVC sandwich panels.

These are fire safety thin materials which are applied inside roof or between drop ceilings. In addition to the roof, elastomeric layers have other uses in construction materials, such as: water pipes, UV exposure coatings, acoustic cover in walls, ducts and pipes.

For more information, you can check our website at or read following article.



Read more: Is Elastomeric Roof Coating the Best Insulation material?



  1. Spray Foam Insulation


Spray Foam Insulation

Foam spray is polyurethane foam spray or SPF. This is a modern type of roof insulation and an alternative to traditional options such as fiberglass, glass wool or asbestos. It is sprayed through a gun onto ceiling panels, concrete slabs or into wall cavities.

In addition to controlling the temperature and humidity of the ceiling and walls; this material is also used to reduce air sound transmission through ceiling and walls. Some of spray foam downsides are higher price compared to traditional roof insulations and damages due to moisture and termite. They might also cause bad smells in some situations.


  1. EPS/XPS rigid roof boards

 EPS/XPS rigid roof boards

Expanded polystyrene (EPS), Extruded polystyrene (XPS) and Polyisocyanurate (Polyiso) are 3 famous insulation materials for your roof and walls. Although EPS is a thermoplastic, it is usually supplied as a rigid foam insulation board. It consists of 98% air and only 2% plastic, making it light weight and easy to carry and move. The closed-cell structure of the foam insulation boards in theses boards keeps moisture out. EPS is more permeable to air and moisture and less resistant to water vapour than XPS.

Although 3 of them have high R-values and thermal efficiency, they are more expensive compared to other roof insulating options and require professional installation.




  1. Glass wool roof insulation

Glass wool roof insulation

This type of roof insulation is primarily made of fiberglass. Glass is melted in a furnace and turned into fibers. Then, using glue, it is arranged in the form of a texture similar to wool. Glass wool fibers create small bubbles that trap air. These air voids make fiberglass a poor conductor of heat which is a strong insulator for roofs and walls. Although glass wool has excellent fire protection thermal features, but there are also some downsides to them, including skin irritancy and respiratory problems, installation challenges, environmental restrictions, etc.


  1. Rockwool roof insulation

Rockwool roof insulation

Rock wool which is another name for mineral wool is made of stone based mineral fiber of basalt rock and some recycled materials. They are melted in high temperature and spun to fibers. Unlike glass wool, rock wool insulation does not irritate the skin as much.

Although it is not as serious a threat as asbestos, it’s still unhealthy. Rockwool has a higher price than glass wool insulation, but less sensitivity and problems. In terms of compatibility with the environment, glass wool has a better performance than Rockwool.

This material is a good sound and thermal insulation with excellent fire safety features and improves energy efficiency of your building.


Best roof insulation material we recommend for your roof

We recommend using UPVC roof sheets that do not need any insulation layers and also rigid elastomeric foam. Because they have a high R-value and boost energy efficiency. UPVC sheets and elastomeric insulation materials are light and strong, cost-effective and recyclable. In case you need to replace your roof, they do not require removing your previous insulating layers or roof panels.


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