Last updated: August 7, 2021

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Construction foam has become indispensable on many building sites and for DIY work. The versatile foam from the can can be used for sealing, insulating or as an adhesive.

The large selection and easy handling make building foam a great material for all purposes. To get an overview of the types and uses of construction foam, we have compiled some important aspects you should know about construction foam below.


  • construction foam is often used in construction, both on large construction sites and in the home, for compacting, insulating or fixing. It is a filling foam that can be filled into cavities or used to quickly fix building materials.
  • Basically, when buying construction foam, you have to pay attention to the area of application, as the composition, colour and properties of the foam vary.
  • In addition, the safety instructions on the foam can must be observed. You may need to buy safety gloves, safety goggles and a protective suit.

The Best Construction Foam: Our Choices

Buying and evaluation criteria for construction foam

In the following, we present some criteria that you should look for when choosing and buying building foam. They are intended to give you a few simple points of differentiation to help you make a decision when choosing building foam.

When choosing construction foam, you can use the following criteria to compare the various choices available on the topic of construction foam:


Construction foam cans or cartridges are available in different sizes. From mini cans with 150ml to cans with 750ml capacity, everything is available. However, the most common are the 500ml and 750ml cans.

In many cases, double packs or other packages with several cans are also offered if there is a need. Together with the foam volume, the quantity will give you a good guideline for choosing the right building foam.


In addition, you can also choose the colour of the foam, which is especially interesting if you want to use it on visible areas. Basically, building foam is available in the classic colours such as white, grey and beige. But construction foam is also available in black, pink, yellow, red and green. The colour of the foam can usually be found on the can.

Foam volume

It is important to note the volume of foam that you get out of a can. This is very individual and should always be read on the can or asked for.

The volume can vary between 8 and 30 litres depending on the can. If you know what you are using the construction foam for and how much space you may need to fill, it helps a lot to know how much you will get out of a can.

Application temperature

There are also important things to consider when it comes to temperature. Here, both the application temperature and the temperature resistance play a role. Here, too, the temperatures vary depending on the type of foam.

The temperature at which building foam may be processed is between -10 and 35 degrees. Building foam is resistant to temperatures between -50 and +110 degrees. You should also take another look at the can to be sure.


Accessories for building foam are very versatile. Basically, various adapters or attachments are offered for the existing cans and guns. But special guns or so-called foam presses are also available.

For the care of these utensils, there is also a selection of cleaning agents, such as cleaning cloths or liquid cleaner from the bottle.

Guide: Frequently asked questions about construction foam answered in detail

Now we would like to answer some important questions about building foam. This should give you an insight into the topic and help you to find the right product for your construction site and your area of application.

What is construction foam?

Building foam is a foam made of polyurethane, PU for short, which can be bought in cans and is used on building sites. The foam is initially in a liquid state, but hardens when exposed to air and is therefore very durable.


Construction foam is used on many construction sites and can be used in different places and with different benefits. (Image source: Paweł Czerwiński/ Unsplash)

It can be used for insulation or insulating, but also for filling cavities or for bonding different objects.

What types of construction foam are there?

There are different types of building foam that generally work in the same way and whose application is similar. Building foam is divided into one-component and two-component building foam.

One-component construction foam only hardens if the area has been sprayed with water beforehand, whereas two-component construction foam dries without water. In most cases, a so-called hardener is needed here to ensure that the construction foam hardens.

Which foam do I use for what?

One-component building foam is particularly suitable for filling small joints or for mounting objects. Objects such as window frames and the cavities created around them can also be fixed with one-component construction foam.

Two-component construction foam is particularly suitable for filling especially large cavities, as the volume increases more quickly after leaving the can and is larger overall than with one-component construction foam

What does construction foam cost?

The prices of building foam do not vary very much. We have given you a small overview of the different price segments in which the prices for a can of building foam are found. However, sets with several cans and the corresponding accessories are often offered.

Price range Available products
Low-priced (3 - 5 €) Mostly own brands from DIY stores
Medium-priced (5 - 10 €) Classic foams from various manufacturers that can be used in a variety of ways
High-priced (from 10 €) Special foams that have special areas of application, for example

What does construction foam adhere to?

The adhesion of building foam depends on the type and manufacturer of the foam. As a rule, you will find information on the can or on the Internet about the surfaces to which the foam adheres. However, most foams adhere to common substrates such as concrete, wood and plastic.

When is construction foam cured?

The curing time of building foam varies greatly in some cases. However, a distinction is also made here between how many minutes it takes for the foam to be ready for cutting and how many minutes it takes for it to be completely cured. Anything from 15 minutes to a few hours is possible. You can also find information about this from the manufacturer on the internet or on the can of your foam.


construction foam is a versatile tool that can be used by both professionals and do-it-yourselfers on the construction site. Its ease of use makes it a good alternative to conventional insulation materials in many respects.

Whether sealing joints or holes created by a pipe bursting through, construction foam seals gaps large and small. Even in combination with water, there are some construction foams that provide a reliable seal.

Most foams also provide sound and heat insulation that lasts reliably for many years. Building foam also has very good adhesive properties and is suitable for assembling a wide variety of objects.

Building foam is available in different colours and is applied either with an adapter tube or a special foam gun. These are often included with the purchase.

It is important to follow the safety instructions on the flammability of the construction foam and also the instructions for working with construction foam. In any case, find out in advance how you can protect yourself and whether you need to buy protective clothing.

Image source: yarlander / 123rf