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We close for Christmas on 23rd December, all orders placed after this date will be dispatched on the 2nd/3rd January - for more information please see our T&C's
We close for Christmas on 23rd December, all orders placed after this date will be dispatched on the 2nd/3rd January - for more information please see our T&C's

Timloc 5560 Felt Lap Vent (Bulk Buys)

by Timloc
SKU TL-FELTLAPVENT/500
Availability:
in stock, ready to be shipped
Availability:
in stock, ready to be shipped
Original price £678.50 - Original price £678.50
Original price
£678.50
£678.50 - £678.50
Current price £678.50

Timloc 5560 Felt Lap Vent (Bulk Buys)

BUY IN BULK

Features & Benefits


> Discrete profile design
> Easy installation
> 2 spring clips to secure each unit in place

Technical Information

> 3000mm additional free vent area per unit
> Suitable for rafter spacings from 400-600mm centres
> Designed only to enhance existing ventilation via felt/membrane lap joints
> Consideration must be given to increased risk of wind uplift and driving rain resistance outlined in BS5534:2014

How Many Vents Do I Need?

The number of felt lap vents can be worked out using the following formula:

Selecting the amount of airflow, then dividing the roof length by the spacing (in meters) indicated below.

Free Flowing Airflow Felt Lap Spacings
Millimetres Meters
5000mm/m ² 600 0.6
10000mm/m ² 300 0.3
15000mm/m ² 120 0.12

For Example:

For a roof that is 7m requires airflow of 10000mm/m ²

7/0.3 = 23.333 or 24 felt lap vents evenly spaced.

For roof spaces that require more than the 15000mm/m ² the spacings half for each additional 5000mm/m ²

Please note these are designed as a remedial solution to roof ventilation and do not meet the standards for permanent roof space ventilation on their own and felt lap vents may adversely affect wind uplift of slates and tiles. For more information, please see our blog on the changes to BS 5534:2014 or see BS 5250 Code of Practice for Control of Condensation in Buildings.

Additional information for retailers:

500 will be delivered as 50 packs of 10 felt lap vents
1000 will be delivered as 100 packs of 10 felt lap vents

Request a quote

Felt Lap Vent Installation Guide

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