Hambleside Danelaw Roof Felt/Underlay Lap Vent - Pack of 50
Hambleside Danelaw Roof Felt/Underlay Lap Vent - Pack of 50 additional 1Hambleside Danelaw Roof Felt/Underlay Lap Vent - Pack of 50 additional 2

£130.33 ex VAT£156.40 inc VAT

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Delivery estimate 3 - 5 working days
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Free delivery on orders over £335 (ex VAT)
Select options to see a delivery estimate
Delivery estimate 3 - 5 working days
See delivery terms for this product
Collections are not available
Product info

The Hambleside Danelaw HD ULV-B Underlay Lap Vent is a simple but effective and highly convenient roof ventilation solution that fits between the overlaps in your roofing felt or roof underlay below tiles or slates. If there is no proper provision for roof space ventilation, or existing ventilation air paths have been blocked, this lap vent will enhance airflow to prevent condensation issues. 

Ideal for easy professional or DIY installation, this lap vent can be fitted from the inside of cold pitched roofs where condensation is a problem. The vent works by creating ventilation openings in your roof space and the shallow, tapered design of the panel suits all common rafter spacings and allows for easy fitting between the roofing felt or underlay.

  • Pack of 50
  • For simple professional or DIY installation
  • Designed for cold pitched roofs
  • Fit between the roofing felt or underlay
  • Solution for homes where high levels of condensation are an issue
  • Ideal if there's no proper provision for roof space ventilation
  • Use if existing ventilation air paths have been blocked 
  • Airflow per vent: 3,200mm²
  • Size: Length: 200mm x Height: 17mm x Width: 270mm
  • Made from Polypropylene
  • Available: Anthracite Grey
  • Product Code: HD ULV-B
  • 20 Year Guarantee

Rafter Centres & Ventilation Area 

  • 400mm: 8000mm² minimum
  • 450mm: 7100mm² minimum
  • 600mm: 5300mm² minimum

We recommend fitting one ventilator panel between each rafter in the lowest underlay lap above the level of the insulation layer in the loft on both sides of the roof.

What you need to know

Delivery charges

  • The delivery charge will be shown in the checkout.
  • If the delivery is missed for any reason, you will be billed again for the re-delivery. See below: failed deliveries.

Delivery access

  • Delivery will be made on small parcel carriers which are vehicles ranging from sprinter vans up to 7.5 tonne lorries.
  • Our sales office will need to be made aware of any delivery restrictions, such as narrow lanes, overhanging trees etc. that may cause restrictions. 

Date and time of delivery

  • We will advise a delivery date to you by email, and your order will be delivered directly to you from Hambleside Danelaw. 
  • Delivery will arrive between 8.00am – 5.00pm. If you can’t be there to accept the delivery, it’s important to leave a note for the driver with instructions where to leave the delivery.

Failed deliveries are chargeable

  • If you cannot be present to accept the delivery, it is important to leave a note for the driver with instructions where to leave the delivery or it could fail.
  • Re-delivery charges apply, in most instances an approximate charge of £10-£12. Actual costing will be confirmed at time of delivery failure.

Damages & missing items

  • All damaged or missing items should be reported to the driver and signed for as damaged or missing, wherever possible.
  • Contact Roof Giant within 72 hours of receipt of goods with all details so we can help you. If you wait too long, we may be unable to help.
  • Any damages must be photographed and submitted along with your claim by email to sales@roofgiant.com.

Do not install purchased items if you have a query with the product (e.g. if you need to query damage that occurred during transit).

  • If an item is installed it will not be refunded or replaced. 

Roof Giant delivery Q&A

Delivery

How much does delivery cost?

Delivery charges will vary and will depend on the manufacturer, weight, size and delivery location. The cost is automatically calculated when you add items to the shopping basket.

How long will I wait for my delivery?

The estimated delivery times are shown on each product page, we will email you each step of the way to keep you informed. The majority of products can be delivered within 3-5 working days.We will advise you if the delivery period is different from than stated on our website.

Do you offer next day delivery?

We currently offer next day delivery on certain brands. If you have a particular item that you require quicker than the guide on our website, please contact our sales team on 01858 455055 during office hours, they will be able to confirm whether a quicker delivery is possible.

What if my delivery doesn't turn up on time?

Please contact our sales office on 01858 455055 or email sales@roofgiant.com and we will advise on the status of your order.

Do you offer free delivery if I spend a substantial amount?

Not as standard, we show the delivery charges separate once you go to the checkout so it is clear what you are paying for the products and delivery costs. If you are ordering larger quantities please contact out sales team who will be able to confirm if this is possible.

Do you deliver on weekends?

Not as standard, our deliveries are made Monday to Friday. If you do need an urgent Saturday delivery please contact out sales team on 01858 455055 during office hours who will be able to confirm. This will incur a premium charge if possible.

Do you deliver to Northern Ireland/Guernsey/The Scottish Highlands/Isle of Wight?

Some suppliers/couriers will deliver to these areas but not all, please contact our sales team on 01858 455055 or email sales@roofgiant.com during office hours for confirmation. If we are able to deliver the product you require, additional transport costs will apply, we will be able to confirm this to you. These additional costs are based on the manufacturer, distributor or courier providing the shipping on our behalf.

Do you deliver to Republic of Ireland, Europe and Rest of World? 

No, unfortunately we nor our suppliers can deliver outside of Great Britain (and Northern Ireland in some instances).

What if my delivery doesn't turn up on time?

Please contact our sales office on 01858 455055 or email sales@roofgiant.com and we will advise on the status of your order.

Returns Policy

Important: Please do not send goods back before speaking to our sales office.
📞 01858 455055 | ✉️ sales@roofgiant.com | 💬 Live chat

We recommend you take photos of the goods and packaging before returning, as this may be required for courier claims.

Your Right to Cancel

  • Under the Consumer Contracts Regulations 2013, you can change your mind within 14 days of receiving your order (or the final part of a split delivery).
  • You must notify us by phone or email first.
  • Goods must be unused, in original packaging, and suitable for resale.

Returns After 14 Days

  • Returns may be accepted up to 30 days but may be subject to a restocking fee.

Refunds & Costs

  • We refund the product price plus standard delivery. Premium delivery charges are non-refundable.
  • Refunds are issued within 14 days of returned goods being received (or proof of posting).
  • You are responsible for return shipping unless we arrange collection, in which case the direct cost will be charged.

Exclusions & Brand Policies

  • Some products and brands have specific return rules (e.g. VELUX, Castle Composites, Midland Lead).
  • Made-to-order items, bagged/powder/plaster products, and sale items are non-returnable unless faulty.

👉 For full details, including supplier-specific terms, please see our Returns & Refund Policy.

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