29.9.2025 Ivan Landa
If you've ever dealt with building or renovating a house, you've probably found that every detail plays a vital role. Quality windows, proper insulation or carefully executed details determine the comfort and longevity of the entire structure. However, the little things that make a huge difference are often forgotten, and the mounting pads are one of those little things that are often forgotten. In this article, we'll look at their features, practical uses and the main benefits you'll appreciate as a professional and as a DIYer.
Purenite is a special construction material made from high-density polyurethane foam that is molded into a rigid plate. This makes it strong, durable and at the same time provides excellent insulation. It does not absorb moisture, is dimensionally stable and does not bend even under long-term load.
Unlike conventional plastic or wooden pads, purenite does not deform, absorb moisture or dry out. This makes it a reliable material for use specifically in the construction industry, where durability and longevity are paramount.
This is why we at ISOparts also use it as a material for the production of mounting pads. In practice, this means that purenite washers can withstand high pressure, do not flex and yet do not interrupt the thermal insulation of the building.
Purenite mounting pads are made from a duroplastic, polyurethane-based rigid foam material which provides excellent properties for a variety of building applications. The great advantage of purenite washers is:
Purenite pads minimize the formation of thermal bridges, especially around windows and doors where the risk of heat leakage is highest. As a result, you will retain more heat indoors while saving on energy costs.
Unlike wood, purenite pads do not absorb water. Even when exposed to a humid environment, they remain dimensionally stable and do not change their properties. This significantly extends their lifetime and eliminates the risk of mould.
The pads can withstand high loads and are resistant to deformation. In practice, this means that windows, doors or other building elements that stand on the pads have a stable foundation. You don't have to worry about them warping or collapsing over time.
Purenite is a material that does not deform even under long-term load or temperature changes. The pads thus reliably hold their shape even after many years of use.
Purenite pads come in a variety of sizes so you can easily adapt them to your specific need. Their strength and precise shape make them easy to work with and installation is quick and hassle-free.
The most common use for them is in the installation of windows and doors. Thanks to their strength, they serve as a stable base that also eliminates thermal bridges. They are therefore used in:
A great advantage is that purenite washers are available in different sizes and thicknesses. This makes it easy to choose exactly the one you need for the type of installation.
*Experience has shown that purenite washers are appreciated by professionals and builders who want to ensure a quality build.
If we compare purenite washers to commonly used materials, the differences are apparent at a glance:
It is the combination of these properties that makes purenite the obvious choice for modern buildings where the emphasis is on quality, energy conservation and long-term reliability.
Always position the pads so that they support the structure evenly. For windows and doors, we recommend placing them in corners and where the frame will be most stressed.
Don't be afraid to combine multiple shims on top of each other, for example to achieve a precise height. Thanks to the strength of purenite, this is not a problem and stability will still be maintained.
Although the pads are precise, still make sure the element is level and properly seated when assembling. This is the only way to guarantee that your windows or doors will function properly.
You might think that plastic shims will work out cheaper. That's true, but they can sag or crack over time. Purenite, on the other hand, will last for decades. So in the long run, it's a more economical choice.
At ISOparts, we specialize in quality insulation materials and accessories for window and door installation. Purenite mounting pads are carefully manufactured, available in a variety of sizes and ready to use. With our years of experience, we guarantee you'll get a product that really works and will meet the demands of even the most challenging building projects.If you want to make sure your building is high quality, economical and durable, it's worth investing in them.
If you are looking for reliable and proven mounting pads, contact us. We are happy to advise and assist you.
