Wet rooms

A new era has begun in wet-room design

The building of wet rooms is subject to standards and regulations set by the Finnish Ministry of the Environment, and the related guidelines and recommendations. A wet room must be constructed in accordance with good building practices. The regulations apply to individual bathroom renovations, as well as more extensive pipe renovation or new build projects. The decree of the Ministry of the Environment on the effectiveness of moisture control technology in buildings has set tighter moisture control regulations for construction projects.
Wet rooms are a crucial part of construction projects. The decree, which came into effect on 1 January 2018 in Finland, includes special provisions to ensure that their moisture control technology is correctly and successfully executed. This new decree and other amendments to the Land Use and Building Act require tighter risk management and more detailed design documentation and detail drawings for wet rooms.

The general regulations and guidelines include minimum waterproofing requirements and waterproofed surface structures, for example. Of course, separate agreement can be made for the achievement of even higher quality goals. Regulations and construction techniques applicable during the renovation phase, and the correct way of realizing wet-room designs, should also be checked.

The regulations also apply to the product development and manufacture of waterproofing systems. Waterproofing systems must be certified, i.e. tested as systems, in Finland. ETA (European Technical Assessment) is a type of international certification, based on which CE marks can be sought for tested waterproofing systems. This means that CE markings cannot be granted for individual waterproofing agents or materials. The ETA is based on the assumption that a wet room will be used for 25 years.

All of Kiilto’s waterproofing systems have been certified and awarded the CE mark. In addition, they all have the:

  • Key flag
  • the option of designing an entire wet room that fulfills the M1 emission classification for building materials
  • the option to design them for locations that meet the LEED certification criteria
  • the option of designing a wet room for facilities granted the NORDIC SWAN
  • the option to interconnect different wet room systems at the point where the floor meets the wall (see Detail Drawing VE37). The Kiilto KeraSafe system can also be connected to Kiilto’s other waterproofing systems at vertical corners of walls (see Detail Drawing VE37).

Kiilto waterproofing systems:

  • Kiilto KeraPro – Fast, one-component, orange, also suitable for air leakage repairs
  • Kiilto Kerafiber – Traditional, one-component, turquoise
  • Kiilto Keramix A+X – Fast, two-component, cementitious, frost-tested, grey, also suitable for air-leakage repairs
  • Kiilto KeraSafe Speed – KeraSafe+ fabric-based, fast to install and highly impermeable to water vapour

Wet rooms should be designed with care

When designing a wet room, take note of the material manufacturers’ working instructions as well as regulations and guidelines. Use the detail drawings and compare different waterproofing systems carefully before choosing between them. The designer must ensure that the materials and methods used have been approved, and check the available quality assurance documentation.

Kiilto’s range of waterproofing systems include the right solution for your location. If the site is challenging or you want to optimise the time used, you can opt to combine various Kiilto waterproofing systems in a wet room. We have tested all our systems for overlapping use: designers can compare the benefits and features of each application and system, and choose the best solutions for the wet room in question. All Kiilto waterproofing systems can be used in both public facilities and private wet rooms.

The design of wet rooms is part of building design

Designing a substrate for waterproofing is one of the keys to success when working on wet rooms. Designers should ensure that capillary moisture is under control and check how moisture control works in the structure. The substrate should only be waterproofed once you are sure that the structure is not subject to capillary action. The substrate must be sufficiently durable. Designers can use our detail drawings to check on the required issues and ensure that the substrate is suitable. Take account of the substrate during the design phase: it is best to present the related requirements in the detail drawing. You can use Kiilto’s conceptual detail drawings to design wet rooms on site, including those where the Kuivaketju-10 model is applied.

Take account of the product selection. In Kiilto detail drawings, we have listed the products belonging to each system product range. By using the products listed in each drawing, you can ensure that your certification concept is realized and only the right, tried and tested products are included in the design. Selecting products only after the design phase enables the most suitable alternatives, which best match the user’s preferences, to be chosen from the detail drawing, for purposes such as levelling and filling. The contractor can explore suitable alternatives from the detail drawing and, for example, circle the detail drawing, recording the document in the design material.