Vents and aerators are available manufactured from PVC, suitable for synthetic waterproofing systems

Wallbarn also supplies vents in PVC, for use with compatible synthetic waterproofing membranes. They are designed to aerate the concrete and help the structure to breath.

As with the TPE Vents for bituminous membranes, PVC decks will also require sufficient aeration to avoid vapour build-up and potential blistering of the waterproofing membrane.

The vent is designed to draw this moisture away from the concrete slab. It is placed onto the bare concrete beneath the waterproofing membrane and insulation.

These vents are installed in a different manner to the TPE varieties in that they will be heat-bonded to the PVC waterproofing membrane, or be bonded with a suitable adhesive, beneath the main membrane. Applicators should get advice from the waterproofing manufacturer for the best installation technique.

The membrane is applied over the base of the vent. This creates a “flue” which helps to draw the vapour out of the concrete. There are a series of ribs along the underside of the round base plate (or flange) to encourage the vapour movement. The ribs on the underside stop about 5 cm from the edge of the base or flange in order to help with the bond between the PVC membrane and the unit.

The top of the pipe or flue has three lateral holes to allow the vapour to escape into the atmosphere. It is covered by a hood or cap which overlaps the internal holes, preventing rainwater entering the system but still allowing the passage of vapour.

Wallbarn recommends a vent is placed at least every 25m2.

As with the other material, Wallbarn can supply the PVC vent in three different sizes. The standard vent (on the left hand side) has a flue of 240mm high and approximately 75mm in diameter. This is the most common type of vent produced.

A shorter, broader vent can also be produced if a shorter pipe is required or the extra-long vent pipe, at 400mm is also available

See the CAD images here

Please see our CAD Images section for more help in detailing these areas.
Measurement is as follows:

G:\WALLBARN Pictures\Outlets - Pro-Ductor\Copy of vents cross section.jpg
D1 is the diameter of the base plate / flange
D2 is the diameter of the flue or pipe at the bottom of the vent
D3 is the diameter of the  flue or pipe at the top (where it meets the cap / hood)

Wallbarn code

Name

D1

D2

D3

H

120-420-240-075

Standard vent 240mm high

320

76

73

240

120-460-160-125

Short vent 160mm high

390

125

73

160

120-460-400-125

Extra-long vent 240mm high

390

125

73

400

 

The PVC vents are UV stable and resistant to the elements. They are designed to be extremely tough and durable, and are designed for long-term durability.

CAPS FOR VENTS

Installers will also need to ensure they purchase a cap or hood for all of these vents.
The black plastic caps will fit onto the PVC vent shafts easily and are fully compatible. There are two designs of hood / flue – a standard round cap; and a special ESTRAER® funnel shaped hood. This comprises two conical funnels which join up at a central hole at the top of pipe, and create an extra suction on the pipe, helping to draw out a greater amount of vapour and air from the concrete.

The standard cap is measured so that D1 is the diameter of the cap at the top; D2 is the diameter at the bottom (where is slots onto the pipe) and H is the height of the cap.

Wallbarn code

Name

D1

D2

H

030-500-900-080

Standard Cap (black)

106

110

80

030-500-900-010

ESTRAER® Cap (black)

75

82

140

 

The special ESTRAER® cap is measured so that D1 is the diameter of the cap at the bottom (where is slots onto the pipe); D2 is the diameter of the funnels at each side; and H is the overall height of the cap including the funnels.

See the ESTRAER® page for more details