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How to seal the bottom of a shop window from the inside and outside. I will also advise you on which product to choose so that the joint meets the requirements of the A+ energy class tightness. For those who want to seal the bottom of a shop window, I suggest using an EPDM gasket, which will ensure the tightness of the joint. The EPDM gasket can be used to seal the bottom of series windows and exterior doors both from the inside and from the outside. This gasket comes in various widths, making it a particularly good choice for sealing wide gaps. The EPDM gasket is completely impermeable to moisture, which is especially important when sealing a shop window from the inside. We will glue the gasket with Roof Façade elastic adhesive sealant, which has good adhesion to many materials. Let's get started. ¥ Prepare the workplace well. ¥ Cut off the required amount of gasket. ¥ Apply Roof&Façade adhesive sealant. ¥ Glue the gasket. The bottom of the shop window is sealed and the window is ready for the next sealing stage. You can find EPDM gaskets in all wholesale departments of building materials stores.