Advantages of the lintel PURbox

20.2.2026 Ivan Landa

If you are dealing with outdoor blinds, roller blinds or screens, you may soon come across where to hide the box so that the facade remains clean, the installation is carried out without complications and the detail around the window has good thermal and technical properties. In this article, we will talk about the lintel PURbox, what it is, what its advantages are and why you should consider it in this context.

What is a lintel PURbox and what is it used for?

The lintel PURbox is a building element designed to create space for exterior shading, i.e. for outdoor blinds, roller blinds or screen blinds, directly at the location of the building lintel. Thanks to this, the shading is ready at the stage of the rough construction and there is no need for additional adjustments above the window. You will get a cleaner appearance of the facade and at the same time unify the detail of the lintel and subsequent layers so that they follow each other without improvisation.

For which buildings is the lintel PURbox best suited?

The lintel PURbox is suitable for you if you want to hide the exterior shielding in the structure and have the lintel detail solved during construction. It is often used in buildings without a contact insulation system, or where the insulation is solved in a different way or with a smaller thickness. You can use it in new buildings and reconstructions, because it allows you to align the windows, shielding, facade in advance and prevents a situation where a solution is sought above the window only when the plaster is finished.

What are its main advantages?

One of the main advantages is that the PURbox helps to solve the sensitive area around the windows, where thermal bridges appear. The window frame connection, the connection joint and the lintel area are among the places that decide how the perimeter structure will function in the long term. The PURbox also includes additional insulation of the connection joint, so you have a better chance of achieving a continuous thermal insulation connection and reducing the risk of local cooling of the structure.

Another advantage is that the space for blinds, roller shutters or screens is solved directly in the lintel. Thanks to this, you avoid collisions with the structure, lack of space and complex additional anchoring. At the same time, you retain freedom in choosing the type of shielding, because PURbox provides space for multiple variants, and you are not forced to choose only based on what you can still fit above the window.

In terms of appearance, you will certainly appreciate the compact detail without obvious boxes and visible covers. If you want the shielding to act as a natural part of the house and not disturb the facade, the concealed solution with PURbox will help you with this. In addition, the clean detail facilitates the continuity of plaster, other layers and reduces the number of problematic connections.

It is also important that PURbox is designed as a system solution that can be adapted to commonly used masonry systems. For you, this means a simpler design of the composition above the opening and a lower risk of having to combine disparate elements.

What types of lintel PURboxes are there and how to choose the right one?

When choosing, you will encounter a variant with integrated lintel insulation and a variant without integrated insulation. The variant with insulation will help you solve the thermal part of the detail directly at the lintel location and will support the continuity of the insulation in this area. The variant without integrated insulation makes sense when you have the lintel and its thermal protection solved in a different way and you mainly need a reliable space for shielding.

When making a decision, also focus on the structural design and subsequent layers. This solution includes a Purenit structural board, an internal coating and a UV protective coating for the front wall. It also includes an aluminum plastering strip with an overlap, which helps create a clean transition into the plaster. It is important for you that the detail is designed in such a way that the plaster, window, shielding and lintel fit together without additional interventions.

How are the dimensions resolved and what if you have a different opening width?

The dimensions of the lintel PURboxes are based on the standard lengths of building lintels, which will make your design easier. If you have a different opening width or an atypical situation, it is possible to adjust the front part by cutting it so that the detail adapts to the specific opening.

We recommend that you consider the dimensions at the same time as you select the windows and shading. In shading technology, parameters that are not visible at first glance are also decisive, such as the size of the package or requirements for service access. If you coordinate these things in time, you will reduce the risk that the lintel or facade detail design will change later.

What should you pay attention to when installing and preparing the facade?

During installation, follow the recommendations of the masonry system supplier so that the installation is correct in terms of statics and connection to the masonry. Before implementing the facade, pay attention to preparing the front face, which should be treated with a penetrating paint or adhesion bridge before plastering so that subsequent layers adhere well.

It will also help you clearly determine who is responsible for the connection detail. Make sure that the connection to the window and the connection joint are correctly resolved and that the selected type of shading corresponds to the space in the box. This will prevent situations where different ideas clash on the construction site between window specialists, facade designers and the shading supplier.

Why solve PURbox together with exterior shading?

Exterior shading will help you reduce overheating of the interior because it captures solar energy before the glass. It will also improve your lighting comfort and privacy. If you include shading in the design already at the rough construction stage, you will get a cleaner facade and a better connected structural detail above the window. The lintel PURbox is one way to achieve this without visible boxes and without additional interventions in the finished layers.

If you want to prevent errors in the lintel detail, contact us. We will be happy to design a lintel PURbox tailored exactly to your project and provide a technically correct and functional solution. With our products, installation will be fast, precise and hassle-free. Contact us today and let our experts prepare a solution that will work reliably for you.