Balcony waterproofing without fire hazard

The executing company faced the challenge of waterproofing 44 balconies of these holiday homes as quickly and securely as possible. For the waterproofing of the balconies, roofer and carpenter Björn Tölle recommended EPDM to the client. This material is particularly weather-resistant and thus durable due to its molecular network structure. Initially, Björn Tölle planned to use RESITRIX® EPDM roofing membranes.

He had had good experiences with this material and had been using it for his waterproofing projects for two years. One particularly important advantage for timber construction, according to the craftsman, is that the seams can be easily welded using hot air, without an open flame and thus without the risk of fire.

Waterproofing with pre-fabricated EPDM sheets

To seal the 44 balconies as quickly and safely as possible, our custom-made HERTALAN® EPDM sheets were the ideal solution. The sheets could be custom-sized in one piece for the balconies to be sealed, minimizing the manual seam connections to be made on site. Only in areas with penetrations, external corners, and recesses at the facade front were the seams connected using contact adhesive.

The sheets were pre-fabricated for the individual balconies and directly delivered to the construction site. The installation was done loosely with ballast. The EPDM sheets were spread over the substrate made of OSB boards, with internal corners folded and fixed using the HERTALAN® seam adhesive KS 96. For the edge bonding, Björn Tölle and his team used the HERTALAN® contact adhesive KS 205, which was applied using a spraying device. Bangkirai wooden planks were laid over the sheets.

Both the timber frame construction and the time savings during the balcony sealing work contributed to a relatively short construction period.