Pro Clima Dasatop is an intelligent airtight membrane for retrofit projects with a robust fleece reinforcement layer on both sides. It intelligently reacts to humidity to become more vapour open as humidity increases and less vapour open when humidity is low; the range over which Dasatop's vapour openness changes with humidity was designed specifically to suit joists and rafters. This makes Dasatop ideal for use as a sub-and-top membrane because this method means some membrane will be exposed on the cold side, above the joists, and some membrane will be under the insulation on the warm side. Only specific intelligent membranes, like Dasatop, can provide the appropriate and different levels of vapour openness at different points along its length to provide optimal protection from moisture all year round.
Pro Clima Dasatop can be used internally in lofts and roofs. In lofts it can be installed flat across the tops of the joists over the insulation installed between them. It can also be installed using the "sub-and-top" method which means over the tops of the joists and pressed into the gaps between each joist to create u-shaped cradles into which insulation will then be installed. When used on roofs, it is installed sub-and-top. It can be exposed to UV and the weather for up to 4 weeks during the roof refurbishment to provide temporary protection to the building prior to external insulation and permanent roof covering being installed over the top.
Dasatop is an intelligent airtight membrane that reacts to humidity to become more vapour open as humidity increases and less vapour open when humidity is low. This changing level of breathability ensures the building and insulation is protected from moisture all year round.
Dasatop has a thick microfibre fleece on both sides. When used in a loft (especially in older buildings) where there are rough timber surfaces and loft debris, the robustness ensures the membrane and its airtightness is not compromised during installation or by foot traffic.
When used on roofs, the sub-and-top method allows roof refurbishment to be completed from the outside without disturbing the interior of the building. This means the building occupants can remain inside the building during the work and internal redecoration is not required.
When Dasatop is installed over loft joists, part of the membrane is in contact with the timber of the joists and the rest is in contact with the insulation and ceiling beneath. When installed sub-and-top, the area of Dasatop in contact with the insulation is mostly on the warm side, underneath the insulation, and the area in contact with the tops of the joists is on the exterior, colder side. The contact with different materials and Dasatop's proximity to both the warmer and colder sides of the roof build-up, at the same time, mean an intelligent membrane, with its specific humidity variable range, is most suitable to provide optimum and reliable protection from moisture. Moisture moves from where it is warmer to where it is cooler. In winter this means from inside to outside; in summer from outside to inside - Dasatop copes easily with this and provides permanent moisture protection for the building at all times of the year.
Dasatop is robust so allows for a quicker installation without having to worry about minor scuffs and scrapes that might reduce levels of airtightness. This is especially useful in older loft environments where you may need to install Dasatop over rough or damaged timber joists and then walk on it. Or when you are manoeuvring (or dragging) timber for loft flooring and walkways around in the loft.
Installed as a "sub-and-top" membrane, Dasatop allows an entire roof refurbishment to be completed from the outside. This ensures the interior will not be affected by the work and the occupants can remain inside for the duration. Great in historic or listed buildings where the interior appearance cannot be modified or damaged by any refurbishment and upgrades to the roof.
As an intelligent airtight membrane you can be confident the fabric of the building and your insulation will be protected from moisture and perform to optimal levels all your round.
