Features & Benefits

  • Enhances existing ventilation via felt/membrane lap joints
  • Offers 3,000mm2 additional free vent area per Lap Vent
  • Suitable for rafter spacings from 400-600mm centres
  • Easy to install
  • 2 spring clips to secure in place
  • Manufactured from recycled Polypropylene

How many Lap Vents do I need?

This will vary dependent on the level of extra ventilation required and length of the roof.

To provide typical ventilation, allow for 1 lap vent every alternate rafter space at low level, on opposite sides of the roof. If maximum ventilation is required, install at high level and every rafter space along the full length of the roof.

Each lap vent provides 3,000mm2 of additional free airflow and is suitable for rafter spacings from 400-600mm centres.

It is recommended that one lap vent should be installed into every alternate rafter space at low level. If further ventilation is required, install one lap vent into every rafter space at low level or into lap joints at higher level.

The lap vents should be fitted to both sides of the roof space in order to provide cross-flow ventilation.

How to install:

1. Ensure the lap vent is orientated with clips facing inwards to the roof space and the flat surface to roof.

2. Insert the pointed edge of the lap vent into the gap between membrane/underlay overlap and then push flat towards roof line.

3. Push the lap vent down inside the joint ensuring the clips hook onto the outer face.

4. The lap vent is in the correct position when the clips are fully engaged onto the top edge of the membrane/underlay. Repeat the installation process with further lap vents until the required ventilation rate is achieved.

Please note, installing lap vents alone will not meet minimum roof ventilation requirements. For guidance and regulations on roof space ventilation please refer to British Standard BS5250.

For specifiers including the lap vent, consideration must be given to increased risk of wind uplift and driving rain resistance outlined in BS5534:2014. You acknowledge that the wind uplift loads on the tiles/slates and driving rain resistance of the membrane can be adversely affected.

£4.99 Standard Delivery, or FREE on most orders over £99* (some exclusions apply)

£9.99 Next day delivery is available for orders places before 12 noon. Any orders placed for next day delivery after this time, will take 2 working days to be delivered.

Working/delivery days are Monday to Friday, deliveries will not normally be made Saturday or Sunday.

We offer a 30-day returns policy on on the majority of our items*, as long as the item is unused, undamaged and unopened**. We only ask that the postage is covered by yourself. 


* Please see our delivery page for further details on specific exceptions.

** Some products that are made to order or personalised cannot be returned.

***Exclusions apply for items shipped directly from our suppliers, and some big & bulky items may incur an additional charge. Please see our delivery page for full details. 

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Timloc 20 x Felt Lap Vent

The felt lap vent designed as a remedial solution to increase the level of ventilation and combat condensation in a roof space
  • 40,50 â‚¬ inc. VAT
  • (Delivery from 5,57 â‚¬ inc. VAT )
Item in Stock   |   Usually dispatched within 24 hours
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Free UK Delivery on most orders over £99
Delivery Rates & Information

Delivery Options

Standard Delivery: £4.99 - Free for all orders over £99.*
Next Day Delivery: £9.99 - Available for orders placed before 12:00 PM (Noon).

Important Delivery Notes

Next Day Delivery Cut-off: Orders placed after 12:00 PM (Noon) using Next Day Delivery will be delivered within two working days.
Working Days: Our standard delivery and shipping days are Monday through Friday. We do not normally deliver on Saturdays or Sundays.

Easy 30-Day Returns

We want you to be happy with your purchase! We offer a 30-day returns policy on all items, provided the following conditions are met:
  • The item is unused and undamaged.
  • The item is returned in its original packaging.
  • The customer is responsible for the return postage costs.

Combining Your Order

We always strive to combine your order into a single delivery. However, your order may arrive in multiple shipments if it contains:
  • Items from different warehouses (Standard items).
  • 'Direct' items (These are shipped separately and directly from the supplier) and will arrive separately from other items in your order.

*Exclusions & Additional Charges

The following items may be excluded from standard shipping rates or may incur extra delivery charges:
  • Items Shipped Directly from Suppliers ('Direct' items).
  • Certain Large or Bulky Items.
Want it by Monday 12th October? Order within 1 hours, 22 minutes
Made up of these products
  • Felt Lap Vent
    Timloc Felt Lap Vent
    Roof Tiles & Ventilation
    2614
    The felt lap vent designed as a remedial solution to increase the level of ventilation and combat condensation in a roof space
    From 1,90 â‚¬ inc. VAT
    In Stock | Usually dispatched within 24 hours
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