How to choose a roof underlay?
The roof underlay is an important part of the building’s roof structure, as it protects the roof structures from moisture and improves the roof’s durability. Choosing the right underlayment is important so that the roof works flawlessly and lasts a long time. This article discusses how to choose the right underlayment for your roof.
What is underlayment and why is it important?
The underlayment is the layer under the water roof that prevents water, snow and debris from entering the roof structures. It also acts as wind protection and improves the energy efficiency of the roof. The choice of underlay directly affects the functionality and durability of the roof.
Undercoat selection criteria
Several factors must be taken into account when choosing an underlay. Here are some key criteria to help you make the right choice:
- Roof type: Different roof types require different underlays. For example, a pitched roof and a flat roof need different solutions.
- Climate: The underlay must withstand local weather conditions, such as heavy rain, snow and wind.
- Materials: Underlays are available in different materials, such as bitumen, plastic and breathable membranes. Choose the material that best suits your roof’s needs.
- Breathability: The breathable undercoat lets moisture out, but not in. This is especially important in warm and humid climates.
- Installation: The installation of the underlay must be done carefully. Choose an underlayment that is easy to install and that matches the structure of your roof.
Different types of underlayment
There are several different types of underlayment on the market that you can choose from. Here are some of the most common:
- Bitumin Kermi: Bitumin Kermi is a durable and waterproof underlay that is especially suitable for steep roofs.
- Plastic film: Plastic films are light and easy to install. They are well suited for flat roofs.
- Breathable underlay: Breathable underlays let moisture out, but not in. They are a good choice for warm and humid climates.
Summary
Choosing the right underlayment is an important part of roof design and construction. Consider the type of roof, climate, materials, breathability and installation when choosing an underlay. This is how you ensure that your roof lasts a long time and functions flawlessly.
You can find more information about underlays and their selection, for example, on the Rakentaja.fi website.
