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Wet Fix Valley Troughs and Joining Strips - 3m

Universal and Slate Valley Troughs

Durable products for roofs constructed in concrete and clay tiles or natural and manmade slates with a roof pitch between 15 and 60°.

To be used at roof valley intersections to provide a weatherproof drainage channel at the point where cut tiles or slate meet.

Timloc Valley troughs are BBA approved and a cost effective alternative to traditional lead lined valleys.

Supplied in 3 metre lengths.

Joining Strip

Designed to create an effective join where tiles or slates meet.  Joining strips are used as an aid to remedial work where new, or dissimilar tiles or slates are laid up to an existing roof covering.

Joining strips form a weatherproof channel at the point where the two types of roof tile or slate meet and can be used on roofs constructed in concrete, clay tiles, or man-made slate.

Supplied in 3 metre lengths.

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Features & Benefits

  • Cost-effective and practical alternative to lead
  • Material of no value to lead thieves
  • Quick and easy to install
  • Special gel coat finish provides added long term durability
  • Available in 3m lengths in packs of 10

Applications

  • As an aid to remedial work where new, or dissimilar tiles or slates are laid up to an existing roof covering
  • To form a weatherproof channel at the point where the two types of roof tile or slate meet
  • On roofs constructed in concrete or clay tiles or natural or manmade slate

Technical Information

  • Universal Valley Trough- suitable for all types of roof covering
  • Slate Valley Trough- specifically designed for roofs constructed of natural man-made slates
  • Joining Strip- for applications where dissimilar roof coverings meet

How to Order

  • Measure the valley length up the slope and divide by 3m (product length) to determine the quantity of the valley troughs required
  • Allow a minimum of 150mm lap if it is necessary to join valley sections

Installation Advice

Valley Troughs

  • Valley boards must be installed to support the valley trough in accordance with the NHBC Standards
  • 19mm thick exterior grade plywood is the recommended material and each valley board should extend at least 200mm from the centre line of the valley
  • The valley boards should be cut so as to fit flush in-between the rafters and be supported on noggins fixed to the sides of each rafter
  • Line the valley intersection with a strip of roofing felt running up the length of the valley and the lap the normal roofing felt over this into the valley area
  • Counter battens must be used to support the edges of the valley trough and the ends of the cut tile battens
  • Fit the first counter batten running up the full length of the valley and laying parallel with the line of the valley bottom
  • Lay the valley trough in position with the angle of the valley trough in the angle of the valley bottom and the outer flange of the valley of the valley trough located on the counter batten
  • Push the valley bottom down firmly into the valley bottom and mark the position of the second counter batten
  • Fit the second counter batten in the position marked, running up the full length of the valley and laying parallel with the line of the valley bottom
  • Position the valley trough between the counter battens and press the valley down firmly into the valley bottom
  • Maintain the downward pressure on the valley trough and nail the valley through the outer flanges into the counter battens
  • Use galvanised clout nails at not more than 1m centres
  • If the length of the valley requires more than one valley trough, ensure that the upper valley trough laps over the lower valley trough
  • The amount of overlap should be a minimum of 150mm at roof pitches of 30° or over and a minimum of 250mm at roof pitches of less than 30°
  • The lapped area should be secured with two nails in each flange
  • Using tin snips or shears, cut the valley trough to suit at the eaves and ridge
  • Make sure that the valley can run off into the gutter, it must not be cut back short, otherwise water may be discharged behind the fascia board
  • N.B. Where to valley troughs meet at a ridge, it is advisable to form a leak saddle to cover the ridge intersection
  • For advice on lead working, Timloc recommend that reference is made to the Lead Sheet Manual Published by The Lead Sheet Association
  • Once the valley is complete, proceed with the tiling or slating as normal
  • Cut the tiles or slates to suit the rake of the valley, leaving an open valley area approximately 125mm wide up the centre of the valley
  • Tiles should be bedded onto fresh mortar laid on the sand impregnated strips, which are incorporated into each valley
  • Slates should be secured with clips or rivets in the normal way

Joining Strips

  • Strip back the roof covering over the party wall to provide room to work
  • Make good the felt and battens over the party wall
  • Position the joining strip on top of the battens directly over the centre of the party wall and nail through the outer flanges of the joining strip into the battens. Use galvanised clout nails spaced at no more than 1m centres
  • If the length of the roof slope requires more than one joining strip, ensure that the upper joining strip laps over the lower joining strip
  • The amount of overlap should be a minimum of 150mm at roof pitches of 30° or over and a minimum of 250mm at roof pitches of less than 30°
  • The lapped area should be secured with two nails in each flange
  • Ensure that the joining strip extends fully from eaves to ridge, do not leave any gaps
  • Make good the tiles or slates
  • The tiles/slates should be positioned so as to meet halfway across the joining strip and should be bedded onto fresh mortar laid on the sand impregnated strip which is incorporated into each joining strip
  • The tiles/slates should be nailed or clipped in the normal way

Quality, Regulations and Standards

  • BBA Approved
  • Satisfies all NHBC recommendations
  • Complies with all relevant Building Regulations and British Standards
  • Manufactured to BS EN ISO 9001 Quality Management System
  • Manufactured to BS EN ISO 14001 Environmental Management System

Material and Colour Choice

  • Manufactured in GRP (glass reinforced polyester)
  • Available in dark grey only
  • nbs plus
  • riba

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