Description:
RTV250CL – Rytons Retro Weep Vent®
General Details
Rytons Retro Weep Vent® (RTV250CL) is a retro-fit weep vent for cavity drainage and ventilation, offering quick installation and a discreet, clear finish.
Features and Benefits:
- Retro-fitted cavity ventilator and weep hole duct for new build or refurbishment.
- Easily retro-fitted through a 25mm dia. drilled hole.
- Ideal solution when no provision has been made for cavity venting or weeps or an insufficient number have been installed.
- Front louvres protect against rain and large insects.
- Flange aids positioning, helps prevent seepage and covers drilling for a neat finish.
- External fins provide a lock-tight fit.
- Clear colour blends with any facing brick or render to maintain the aesthetic appearance.
- Use in timber frame and traditional build.
Important: This is a plastic component and is not suitable for use in the following:
a) external walls of buildings over 11m high where people sleep, whether residential, institutional or hospitality; or
b) external wall surfaces within 1m of a boundary where the building is 11m high or less, in England.
For a compliant alternative, see Rytons A1® Fire-rated Range.
Size:
80mm L (excluding flange) x 26mm Dia. (including fins).
CAD drawing available by email.
Free Area:
250mm² per unit.
Colours:
Clear.
Composition:
Polypropylene.
Installation – General:
- Drill a 25mm diameter hole through the external leaf at a slightly upward angle.
- Position the front louvres horizontally using the “top” marker on the flange as a guide.
- Firmly push the Rytons Retro Weep Vent into the pre-drilled hole, ensuring the front louvres remain horizontal.
- Continue pushing until the external flange sits tight and flush with the wall.
- If required, tap lightly into position using a rubber mallet.
Installation – Cavity Venting:
- For cavity ventilation space according to current regulations at the top and bottom of the cavity wall to ventilate the cavity and assist in the drying out of the wall. Lower ventilators should be placed below the dpc, unless cavity trays are used when they should be positioned above the tray. Vertically stagger vents when placing them above and below horizontal fire stops.
- NHBC Standards 6.2 – External timber framed walls
Install every 462mm. Ventilation openings should be equivalent to open brick perpends every 1.2m (i.e. 650mm² free air every 1.2m). These openings can also provide drainage of the cavity.
- The Building (Scotland) Regulations – Domestic. Masonry outer leaf 3.10.6
Install at 1m centres. Where the outer leaf is a masonry construction, cavities should be vented to the outside air by installing ventilators with at least 300 mm² free opening area at 1.2 m maximum centres. Precipitation, i.e. rain, snow and sleet, can penetrate the outer leaf of an external wall and cavities are normally drained through weep holes. These weep holes can also provide the necessary venting.
- British Standards BS 5250
Refer to current guidance for cavity wall ventilation and moisture control.
Installation – Weep Hole Ducts:
- As weep hole ducts space every fourth brick to drain cavities above and below the dpc, and above lintels and cavity trays. At least two weep holes should be provided over an opening, i.e. lintel.
- NHBC Standards 6.1.17
Where fairfaced masonry is supported by lintels weep holes should be provided at a maximum of 450mm intervals and each opening should have at least two weep holes.
- NHBC Standards 6.11.7c
Rendering shall be detailed to ensure appropriate weathertightness and durability. Issues to be taken into account include … c) weepholes. Weepholes should be provided: where required for ventilation to timber frame construction; to the last tray at stepped abutments; in severe or very severe exposure zones where rendering is returned back into the window or door head (weepholes are not required where the render is not returned); to cavity trays on parapet walls.
- The Building Regulations, Approved Document C, internal and external walls (moisture from the ground)
- 5.5 (b) If the wall is an external wall, the damp-proof course should be at least 150mm above the level of the adjoining ground.
- 5.5 (c) If the wall is an external cavity wall provide weep holes every 900mm to assist in the transfer of moisture through the external leaf. Where the damp-proof tray does not extend the full length of the exposed wall, i.e. above an opening, stop ends and at least two weep holes should be provided.
- British Standards BS 8215
Refer to current guidance for design and installation of damp-proof courses and cavity trays.
Handling Information:
- Box quantity: 50 number.
- Box size: 28cm W x 11cm H x 14.5cm D.
- Box weight: 0.5kg.
NBS Specification:
Rytons is proud to be a family run business and British manufacturer since 1972
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