Two-level gullies

Drainage solutions are an integral part of modern architecture. Unfortunately, we are increasingly encountering problems of flat roofs, which are related to malfunctions of vapor barriers or their insufficient processing.

The problem of installing drainage without using a two-level drain

The main problem of the construction without a two-level inlet is the complicated connection of the vapor barrier and the pipe, respectively, the sealing of the passage point through the ceiling structure. The roof must be temporarily drained after the completion of the vapor barrier, but the insulator, after laying the thermal insulation, can no longer get to this point to form a joint.

This point of the roof is particularly exposed to the effects of water vapor. Firstly, because the very hole in the ceiling plate facilitates their penetration into the structure. Further, because the water flowing into the pipe from the surrounding environment cools it, increasing the condensation of vapors on its surface. Therefore, every even minor defect will be more pronounced here. As the tightness of the structures increases and the difference in partial pressures increases, this effect becomes even stronger.

Solving problems with drainage of insulated flat roofs

One of the elements that helps prevent these problems is the two-level inlet from TOPWET. TOPWET drains have an integrated cuff, which significantly facilitates the connection of waterproofing, and a durable construction made of thermoplastic polyamide PA6. Long-term trouble-free functionality is also aided by the system lockable basket.

In the case of two-level wiring, two drains are connected by means of gaskets, thereby ensuring perfect tightness from both vapor barrier and waterproofing. This connection is designed in such a way that it can be made very simply during the phased implementation of work on the roof.

The two-level inlet from TOPWET connects the cuff to the vapor barrier layer. It has a double-walled structure that limits the formation of condensation on the pipes. After laying the thermal insulation, an extension (TWN) is put on, which is pushed through the thermal insulation up to the seal of the drain. Its length is adjusted by cutting and anchoring with the help of system washers and roof anchors. After that, it remains only to connect the cuff with the waterproofing.

Additional benefits

One of the advantages is that in the case of an electrically heated drain, it is enough to simply bring the cable only to the lower inlet, for example, along the drain pipe, and there is no need to create a vapor barrier puncture.

It is also worth noting a two-level solution from two single-wall drains (TWJ). This solution is especially designed for structures where a sufficiently large building opening is not created or it is necessary to use a remediation drain to connect an existing pipeline.

Do not hesitate to contact us!

If you have any questions or need advice on a specific project, please feel free to contact us
on the technical support line +420 777 701 241 or email to [email protected].