Even smaller roof leaks can lead to bigger problems if they are left untended.
Permeable seamless roof surface.
Any moisture driven up from the attic will condense on the underlayment underside.
Regardless of your roofing underlayment choice your insulated roof assembly will not dry to the exterior unless the roofing is vapor permeable.
The top layer is the actual paving material.
The new standing seam metal roof is to be installed over the existing 1x4 skip sheathing so no solid roof deck.
Seamless roof coating solutions take care of this immediately though in many cases.
Other types of roofing including cedar shingles and concrete tile roofing are fairly permeable.
From the top down there are four layers to permeable paving.
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Impermeable impervious surfaces are solid surfaces that don t allow water to penetrate forcing it to run off.
With the new seamless barrier.
These steel purlins are also used in steel sided buildings that have osb wall sheathing.
Permeable surfaces also known as porous or pervious surfaces allow water to percolate into the soil to filter out pollutants and recharge the water table.
In this particular job the roof is vented.
A breathable 34 0 perms but waterproof membrane like siga majcoat membrane and elevating the standing seam metal roof off of the decking to allow any water than may be in the osb sheathing to dry.
But the attic floor air seal is terrible there s a huge attic stair that leaks like a sieve.
Each of these different layers acts as a filtration system to clean storm water.
Consider permeable paving in large walkways or driveways and make sure that a 6 inch gravel bed is immediately below the porous material.