Rytons A1 Fire-rated Metal Rytweep® (Fire-rated Cavity Weep)

General Details

Rytons A1 Fire-rated Metal Rytweep® (Fire-rated Cavity Weep)

  • Concealed cavity weep hole duct diecast in A1 fire-rated metal protected by a two-part electroplated coating.
  • A pre-formed component long established as an effective method of allowing the cavity to drain freely without obstruction.
  • Quick and easy to position as work proceeds and virtually invisible within the mortar joint so not to detract from the appearance of the brickwork.
  • The acclaimed tapered design restricts the entry of wind-driven rain to prevent staining, meeting NHBC Standards and maintaining the aesthetic appearance of the building.
  • Custom RAL colour tip and overspray available in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
  • Considered fire class A1 without testing, as per European Commission paper 96/603/EC referred to in BS EN 13501-1:2018.
  • Suitable for use in high-rise buildings with a storey 18m or more above ground level to Regulation 7(2) and Building Regulations Approved Document B.
  • Suitable for use in buildings with a storey 11m or more above ground level to Building (Scotland) technical handbook 2019: domestic and non-domestic, 2.7.
  • Classification: A1.  Definition: Non-combustible.  Description: No contribution to fire.

Rytons A1 Fire-rated Metal Rytweep® (Fire-rated Cavity Weep)
A1 fire-rated concealed cavity weep hole duct.
Ensures the cavity can drain freely without obstruction.
Custom RAL colour tip and overspray available in matt, semi-gloss or gloss finish (achieving A2-s1, d0).
UK Patent Pending GB1916157.9.
Registered Design 6078064.
Product Code: RYTWEA1METAL.

NBS Specification Paragraph:

Size:

  • 101mm L x 66mm H x 10mm W.

Colours:

  • Self-colour.
  • Tip and overspray fire-rated RAL colour powder coating available.

Composition:

Installation:

  • Installation is fast and easy as work proceeds with the Rytweep® replacing a vertical mortar joint.  Ensure the tapered end with the circular outlet is facing the outside and is flush with the external face.  Position the bottom of the Rytweep® on the mortar bed against the brick/block.  Postion the next brick alongside the installed Rytweep® and mortar in until only the small weep outlet is visible (ensuring the outlet does not become blocked).  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.

Regulations/Reference Material:

  • 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.
  • Also, refer to British Standards BS 8215.

Fire-rated Regulations/Reference Material:

  • Extracts from NHBC Technical Extra 25.
  • Page 14: Note: in most cases, a panel of the tested system wouldn’t contain all the components necessary to function as an external wall (for example, cavity trays, weep holes, etc.). Therefore, any additional components must achieve Class A1or A2-s1, d0.
  • Page 16: Minor components within or passing through an external wall: The aim of the regulation is to remove all combustible components from, or within, an external wall.  The majority of air bricks, weep holes, ventilation ducts, etc. can be produced from materials meeting Class A1 or A2-s1, d0, so products meeting these classifications should be used.
  • The Building Regulations Approved Document B (Fire safety) – Volume 1: Dwellings (2019 edition). Appendix B: Performance of materials, products and structures B4. NOTE: Regulation 7(2) limits components used in or on the external walls of certain buildings to materials achieving class A2-s1, d0 or class A1 (see Section 10). Assessments cannot be used to demonstrate compliance with this requirement.
  • The Building Regulations Approved Document B (Fire safety) – Volume 2: Buildings other than dwellings (2019 edition). Appendix B: Performance of materials, products and structures B4. NOTE: Regulation 7(2) limits components used in or on the external walls of certain buildings to materials achieving class A2-s1, d0 or class A1 (see Section 10). Assessments cannot be used to demonstrate compliance with this requirement.
  • Building (Scotland) technical handbook 2019: domestic. 2.7 Spread on external walls. 2.7.1 External wall cladding. Storey height more than 11m – Where the building has a storey at a height of more than 11m above the ground the external wall cladding system should be constructed of products achieving European Classification A1 or A2.
  • Building (Scotland) technical handbook 2019: non-domestic. 2.7 Spread on external walls. 2.7.2 Specified attachments. There is a risk of vertical fire spread from specified attachments to an external wall including balconies, solar panels and solar shading. Solar shading are devices attached to an external wall to reduce heat gain within a building by deflecting sunlight. Fire-fighters may not be able to apply a water jet from a fire-fighting hose directly onto a fire that has spread onto specified attachments high above the ground.
  • Where the building has a storey at a height of more than 11m above the ground, specified attachments should be constructed of products achieving European Classification A1 or A2.

Handling Information:

  • 50 per box.
  • Box size: 28cm W x 11cm H x 14.5cm D.
  • Box weight: 3kg.