damp course

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damp course

[¦damp ‚kȯrs]
(civil engineering)
A layer of impervious material placed horizontally in a wall to keep out water.

damp course, damp check, dampproof course

In masonry, an impervious horizontal layer of material (as tile, dense limestone, metal, etc.) to prevent the capillary entrance of moisture from the ground or a lower course, but used also below copings, above roof level in chimneys, and elsewhere to stop downward seepage.
References in periodicals archive ?
Occasionally, I find the damp-proof course has been lost as the mortar joint has been repointed or the external render taken down to ground level.
Below the damp-proof course the bricks are constantly sucking up moisture from the ground.
Roofs, gutters, flashings, patios, gardens and in some instances damp-proof courses are all critical in determining the overall condition of our buildings.
If the damp is at the bottom of the wall, it's probably rising damp, in which case you'll need a specialist to install a new damp-proof course.
NEVER lay paving above your house's damp-proof course.
Often, after landscaping work, paving gets laid over the existing ground, raising it above the damp-proof course.
Rising damp: This occurs, if there is a problem with the damp-proof course.
Many or even most older homes now have courses inserted retrospectively into the main supporting walls but almost without exception no damp-proof course was installed retrospectively into the walls that support the floors, and that's where they are needed most.
If your home doesn't have a damp-proof course, or it's defective, you'll need a damp specialist to install one, but it may be that the course is being prevented from doing its job.
To prevent the patio affecting your home's damp-proof course, its surface must be at least 15cm below the course, although you can reduce this to 10cm if you put a 30cm-wide row of gravel between the patio and the house.
Hunt told her she needed work on her ridge tiles and chimney stacks as well as repointing and a new damp-proof course on a back wall.
I'm always amused when vendors smugly tell me that they have had a damp-proof course fitted to their older home.