What is horizontal DPC? A damp-proof course (DPC) is a horizontal barrier in a wall designed to resist moisture rising through the structure by capillary action – a phenomenon known as rising damp.
DPC is used to stop dampness in buildings.
What is horizontal DPC used for? (In scientific terms, this is cause by capillary action.) To prevent this happening, a damp proof course (DPC) is inserted in any walls which rest on foundations laid in the ground. This is intended to provide an impervious barrier to water. The DPC is installed as a horizontal layer between two courses of brickwork.
What is a horizontal damp proof course? Horizontal damp proof course is a type of insulation used to protect the foundations against moisture. It is laid horizontally between the strip footing and the foundation wall as well as at the connection point of the foundation walls and the external walls of a building.
Why must horizontal DPC not be allowed to project into the cavity? Where a separate damp proof course is laid on each leaf at the base of a wall it is essential that the DPC is not allowed to project into the cavity allowing mortar droppings to build up and cause possible bridging of the cavity and moisture penetration across the cavity to the inner leaf.
What is horizontal DPC? – Related Questions
How thick is DPC?
A 0.55mm thick Polyethylene DPC suitable for all types of where Radon resistance is required.
How is DPC laid?
Lay the DPC on a full even bed of fresh mortar in one continuous length, for the full width of the leaf. Provide at least a 100mm overlap at any joint or corners. The DPC must not obstruct the cavity. Ensure the external edge of the DPC is visible and not bridged by mortar when completing pointing of the mortar joint.
Is DPC finished floor level?
Unlike timber suspended floors where the damp proof course will be sited below floor level with solid constructed floors the DPC should always be sited above finished floor level and should be visible. The building incorporates a physical bitumen damp proof course within the outer and inner leaf walls.
Do you need wall ties below DPC?
It depends on how high the dpc is off ground level or how deep the foundation is in the ground, if possable use a trench block in the ground or if using concrete blocks use wall ties every two course (450 high & 900 long) then fill cavity with a lean mix of concrete to a level of 150mm below dpc.
How do I find my DPC level?
You can find your DPC by taking a look at the external wall. Look down at ground level and look up about 6 inches or so up the wall. Somewhere around here you will see a thin black line of either slate or plastic running horizontally across the brick work. This is your DPC.
What DPC stands for?
What is Damp Proof Course (DPC)
Why DPC is not provided under doors?
Why is DPC not provided at sills of doors
Can a DPC be stepped?
When you are building on a sloping site, the dpc (damp proof course) should be stepped on the external wall. As long as the Dpc is a minimum of 150mm from the ground, you can step the dpc as much as you like. However, the dpc on the internal wall, should be level all the way round to match the existing dpc level.
Does DPC weaken wall?
It shifts very easily – it’s obviously a weak spot in the wall.
Maybe when everything is built up and the roof is on, you don’t have to worry about it, but you still have to admit that you are compromising the strength of a wall with a DPC, versus one without.
Is a cavity tray at DPC?
There isnt normally a cavity tray at dpc level, unless in instances where the likes of a Radon Barrier is required, which should overlap inner wall, cavity and outer wall. You would then need a cavity tray above with weep holes.
What is the minimum thickness of DPC?
DPC is made up of cement concrete of mix 1:2:4 (1-cement: 2-coarse sand: 4-12.
5mm stone aggregate) mixed with a good quality waterproofing compound.
The waterproofing compound should be mixed as per the manufacturer™s instructions.
The DPC should be of 40mm thickness and should be of uniform thickness.
Is DPC necessary?
Do you actually need damp proofing
Why DPC is provided?
A damp-proof course (DPC) is a horizontal barrier in a wall designed to resist moisture rising through the structure by capillary action – a phenomenon known as rising damp.
DPC is used to stop dampness in buildings.
In theory, due to capillary movement of water, water rises from the earth to the building.
What is the nominal thickness of DPC?
For residential buildings DPC consists of a layer of – 40 mm thick cement concrete 1:2:4 (1 cement: 2 Coarse sand: 4 graded stone aggregate 12.
5 mm nominal size ).
Does DPM go under DPC?
Whilst we are on the subject, it is normal that the DPM overlaps onto the DPC (Damp Proof Course). The DPC is normally laid within the bed joint of the brickwork or blockwork, primarily to stop ground damp from rising up the walls by capillary attraction.
Can I use DPM as Vapour barrier?
Can you use a DPM as Vapour barrier
What is the unit of DPC?
Damp proof course: Unit of measurement is sq. m and unit of m² payment is also sq. m.
