Why an airtight loft hatch the at35 metal loft hatch is the first air tight loft hatch of its kind.
Air tight attic hatch.
Insulated to meet part l of the building regulations the at35 is airtight in both positive and negative air pressures at 50pa.
This one manufactured by battic door maintains the house s air barrier.
An attic hatch is usually located in a hallway or closet where the homeowners see it daily.
The whole hatch is a thermal bridge with the situation at the junction with the ceiling a particularly weak point.
By eric whetzel june 6 2018.
Yet i mean once the homeowners fire up a blower door and whip out their infrared camera the problems with attic hatches are pretty obvious.
Unique design features also make them easier to install more reliable and more attractive than traditional attic ladders.
To achieve this the design creates an effective seal that has been tested against aging which is maintained by means of a pre stressed spring which.
Why well the first big issue is if it is done properly you wouldn t be able to open it as it needs to be air tight.
Having searched online for a simple design in the past i knew that there was literally not a single good article or resource on constructing a truly airtight attic hatch.
A wellhöfer airtight insulated attic hatch can be fitted in the ceiling of an airtight newbuild or refurbishment retrofit to prevent heat loss through the roof space and eliminate air leaks.
Even though attic hatches can be huge air leaks and sources of radiant heat loss they are rarely fixed.
The image above shows an uninsulated airtight hatch and the impact on the loft insulation.
Airtightness products pricelist click here.
Not only does this not work properly but you have just created an unsafe.
As loft or roof space access requires a large hole in the insulation and airtight layer of a building the attic hatch is critical to the effectiveness.
Wellhofer airtight attic hatch.
This hatch is designed specifically to meet the stringent demands new properties are subjected to ensure they are as airtight and well insulated as possible.
We supply attic hatches that have been tested to stringent standards including passivhaus certification and offer the highest level of airtightness ensuring that your energy usage is not affected due to a poor fitting or draughty attic hatch.
My favorite ones are the ones with an attached ladder they install the foam between the ladder the hatch.
Installing an airtight attic hatch the right product and careful installation preserve the air barrier and save energy.
An attic hatch can be a serious air leak.
The hatch is available in several versions depending on the.
For advice on which airtightness product is best for your project please contact us on 01484 461705.
Attic ladders and hatches our insulated airtight attic ladders provide convenient access to an attic without compromising a building s thermal performance.
