What is a cavity drain?
A Cavity Drain system is made up of a cuspated membrane applied to the walls and floor with a channel at the wall/floor junction. The membrane allows any water ingress to filter down to the slab and find its way to the perimeter channel. The channel directs the water to a sump pump which is situated below the slab.
How thick is a drainage cavity?
Internal Cavity Drainage System Cavity Drain R7 is a 0.5mm thick HDPE profiled sheet, with approximately 7mm high studs.
What is membrane drain?
NP Drain is an external waterproofing membrane that drains groundwater away from your property reducing the hydrostatic pressure (water pressure). A compact two-layer geocomposite membrane which offers high drainage capacity through specially-configured dimples.
How do you install a cavity drain membrane?
How To Fit Cavity Drain Membrane For Above Ground Damp Proofing
- Wall to be worked on.
- Carefully remove skirting board.
- Carefully hack off plaster back to stone, brick or blockwork.
- Drill 12mm holes 150mm over external ground level and inject DPC cream.
- Apply primer sealer to wall.
- Affix membrane to the wall .
What are cavity trays made of?
Cavity trays can be formed using a pliable material such as lead, but more commonly they are pre-formed, with a wide range of shapes allowing for different cavity widths, corners, stop ends, steps, lintel shapes, arch shapes and sometimes incorporating external flashing.
What is the purpose of mortar net?
Description. MortarNet helps prevent moisture damage to masonry cavity walls by preventing mortar droppings from blocking the weep holes and by providing hundreds of clear drainage pathways that allow moisture to flow to the weeps. Its open mesh also allows air movement to help equalize pressure and dry the cavity.
Can you use damp proof membrane on walls?
The answer is most certainly yes! Applying a damp proof membrane to walls can be an excellent solution for damp problems inside the home but we first must diagnose what is the cause of the damp issue.
What is Type B waterproofing?
Type B Waterproofing refers to any integrated waterproofing system that results in the property/structure being waterproof by design. This usually means that the functionality of Type B waterproofing system is established at the waterproofing design stage and integrated during construction.
How do drainage mats work?
A drainage board, or drainage mat, helps water flow away from the foundation. Without it, water can stay trapped against the concrete or pool at the bottom. Drainage mats come with a dimpled design that lets water accumulate and flow away, creating an air gap.
Can cavity trays fail?
Penetration of the cavity tray Problems can occur when the cavity tray goes under any flashings or DPC’s associated with the detail. Failure to extend the cavity tray in front of the window head may divert water down the face of the frame or onto the back of the frame, where it may accumulate in weathering grooves.
Are cavity trays necessary?
Cavity trays are an important feature in external cavity walls to assist in ensuring any water is directed outside the building. Incorrect specification or installation can lead to defects in the wall and water damage that might be expensive or needlessly destructive to rectify.
What is a mortar screen?
Mortar/Grout Screen (MGS) is a 1/4″ square monofilament screen fabricated from high-strength, non-corrosive polypropylene polymers which offers the following benefits: Isolates flow of grout in designated areas requiring reinforced concrete block. Allows for greater bonding of masonry anchor in hollow block …
Where should a linear drain be placed?
Linear Drain Location A linear shower drain, or strip drain, can be best placed at the shower door wall or at the wall opposite. Linear drains should not be placed perpendicular to the shower door wall as it creates an uneven and unsafe surface. Placement is dependent on the slope requirements.
How long does damp proof membrane last?
Most damp proof wall membranes are made from HDPE and have a high compressive strength and a long life expectancy (over 30 years). They are extremely flexible and have an elongation break of over 40% therefore they are able to deal with structural movement.
What is type C waterproofing?
Type C waterproofing refers to waterproofing systems that manage water ingress. Type C systems will use a combination of structural waterproofing membrane, basement floor drainage and a sump pump. Type C waterproofing is defined by the British Standards Institute (BSI) code of practice BS8102:2009.
What is Type A water proofing?
Type A waterproofing systems are barrier membranes or waterproof coats such as bitumen which are applied directly to the building structure. The membrane can be applied inside or outside the building to prevent fee water entering the building.
What is R7 cavity drain made of?
RIW CAVITY DRAIN R7 | Data Sheet Cavity Drain – Data Sheet Cavity Drain R7 is manufactured from 0.5mm translucent high density polyethylene with studs approximately 7mm high. Other systems are available for specific uses, refer to Typical Uses inside.
What ancillary products are available for use with cavity drain R20?
RIW produce a range of ancillary products for use with Cavity Drain R20 which include: Sealing Rope – a self-adhesive rope for sealing between individual sheets and around services, fixings etc. Brick Plugs – a fixing plug for vertical fixing of the Cavity Drain.
How do you protect a cavity drain R20?
Vertical surfaces should be protected, by casting concrete against the Cavity Drain R20, or by building an inner masonry wall. Inner masonry walls may be tied back into the Cavity Drain R20, by fixing into the Brick Plugs. A similar method can be adopted should a ‘dry lining’ system be required.
What type of drainage system does riw use?
The systems are designed to control and discharge water entering a structure, in full accordance with BS81902:2009 Type C (drained) protection. For more information about our cavity drainage systems and channel drainage, contact the RIW Technical Department.