I put a vapor barrier

I put a vapor barrier



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Are you looking for perfect insulation for your home? Attach a vapor barrier between the insulation layer and the finish. The different activities of the inhabitants of a house (cooking, breathing, drying clothes, etc.) create water vapor. This can penetrate into the insulation and damage it. Over time, your home will be less well insulated. The vapor barrier also serves as a wind barrier. For it to be effective, you must put it down carefully so that it does not allow any draft to pass.

Step 1 - I choose the right solution

Today, vapor barriers are synthetic membranes. Some of them have a breathable wall which limits the entry of water vapor, facilitates its exit towards the outside and does not prevent it from coming out on the inside as soon as the hygrothermal conditions allow it. This is called an "intelligent vapor barrier".

Step 2 - I prepare tools and I find help

To install your vapor barrier, you need a pair of scissors and a stapler. It will be easier to do this work for two people: you will have great lengths to handle.

Step 3 - I take the measurements and I cut

First, you will need to take the measurements of your ceiling to know how many pieces you will cut and the length you need. Most breathable walls have markers every 10 cm to facilitate measurements and square cuts. Take the overlap of the strips into account when measuring the cut. Keep between 5 and 10 cm on each side so that each strip is properly covered.

Step 4 - If there is a chimney

If your roof has a chimney, be sure to respect the safety perimeter which is 20 cm between the vapor barrier, combustible materials, and the chimney. If your chimney is lined the distance will be reduced to 8 cm.

Step 5 - I stretch the vapor barrier over the insulation

It will be necessary to correctly tension the vapor barrier and staple it on the battens. This is the most delicate part. For this it is better to be two. Get an electric stapler, it will be easier.

Step 6 - I stretch the corners

Remember to tighten the corners well and ensure the continuity of the breathable wall. Steam will concentrate in the smallest hole. If necessary, install several staples closely together.

Step 7 - I caulk the roof openings

Watch out for roof openings! Better to make several overlaps to avoid condensation than to be too fair in your measurements. If recovery is difficult, make several cuts.

Step 8 - I strengthen the seal

You will reinforce the waterproofing, once the material is installed with an adhesive. But it is important to have provided a large overlap so as not to favor any air outlet.

Step 9 - I lay the battens

In order to perfectly tension the material, place battens every 50 cm on the battens lengthwise and around the edge of the roof. These battens will then be used to lay the finishing siding.

Step 10 - I install the finishing joint

To perfect the waterproofing, you will put a joint of putty or an adhesive when possible on all the circumference of the roofing.
Here you are, you have just finished installing your vapor barrier. With good ventilation and adequate insulation, you should be protected against humidity!