This product will be delivered by one of our approved suppliers

Your Account

Due to forthcoming changes to improve security, older browsers* will no longer be able to handle payment online. These updates are part of an industry-wide initiative to improve standards

Please check your browser, you may need to update it.

CONNECT HERE

NEED MORE HELP?

Please remove invalid characters (e.g {{invalidCharacters}}) and try again

This will change the location for any other collections you currently have in your basket

Changing your selected store to {{storeName}}

Add this item to your basket for delivery

Send an email to {{email}}. Opens in your default email application in a new window.

Call {{phoneNumber}}. Opens in your default phone call application in a new window.

Departments

| Screwfix

Product is unavailable for Collection

Add this item to your basket for Collection

Product is unavailable for Delivery

Add this item to your basket for Delivery

Collect Service

This won't take a second...

You need to update your cookie setting to view video content. To do this simply set the YouTube cookie to be 'on'. You can make this change here.

You need to update your settings to view this content.

Over 4,000 products available for delivery between 48hrs and 72hrs to Spain, Poland, Belgium, Netherlands, Austria and Sweden.

For delivery to Europe

Plus de 10 000 produits livrables à domicile en France métropolitaine et en Corse.

Pour une livraisonen France

Over 10,000 products available to Click & Collect in as little as 1 minute & 27,000 products available for home delivery.

For delivery to ROI

Please select by delivery location

Over 10,000 products available to Click & Collect in as little as 1 minute & 57,000 products available for home delivery.

For delivery to the UK (inc NI)

Embedded Screwfix YouTube video

Best sellers...

Extra range is available for free next day collection in store. It's also available for free next day delivery when you spend over £50. Geographical restrictions apply.

Extra Range

We suggest you amend your filter selection, or <ClearFiltersLink>clear all filters</ClearFiltersLink>

testAudience

tenant

UK Website

IE Website

$opt_dummy_attribute

Optimizely-Generated Audience for Backwards Compatibility

branded-cards

We accept:

product-listing-page-layout

green-star

Green Star

approved-supplier-deliveries

Approved Supplier Deliveries

risk-assessment

Risk Assessment

privacy-policy

Privacy Notice

a---z-brands

A - Z Brands

find-a-store

Find a Store

electricfix-config

screwfix-sprint

Screwfix Sprint

screwfix-card

Screwfix Card

fuds

click-collect

Click & Collect

about-screwfix

ABOUT SCREWFIX

below-header-merch-area

plumbfix-config

18th-edition-wiring-regulations

18th Edition Wiring Regulations

error-block

footer

faqs

FAQs

shopping-with-us

SHOPPING WITH US

secure-payment-options

Secure Payment Options

responsible-disclosure

Responsible Disclosure

help-link

Need Help

Roofing Underlay

Cromar  Vent3 Classic Waterproof Roofing Membrane Grey 50m x 1m

Cromar  Vent3 PRO Waterproof Roofing Membrane Light Green/White 50m x 1m

Cromar  Vent3 Waterproof Roofing Membrane Blue Upper Surface 50m x 1m

Buy Waterproof Roofing Membrane Roofing Underlay at Screwfix.com. Buy online & collect in hundreds of stores in as little as 1 minute! 60 days free credit available. Choose from top trade brands. Delivery 7 days a week

product-listing

returns

Returns

more-from-screwfix---sfx

MORE FROM SCREWFIX

<section style="background-color:#2E2CFF">
<a href="https://www.screwfix.com/search?search=easterdealspromo">
<div>
<span style="color:#FFFFFF;font-family: 'screwfix_betaregular', arial, sans-serif;">EASTER DEALS END 6TH APRIL. CRACK ON! SHOP NOW</span>
<span style="border-bottom:8px solid transparent;border-top:8px solid transparent;border-left:8px solid #FFFFFF;margin:0 3px -1px;display:inline-block"></span>
</div>
</a>
</section>
</section>

promo-merch-banners

smart-homes

Smart Homes

website-terms-conditions

Website Terms & Conditions

main

cookie-preferences

Cookie Preferences

plumbfix

Plumbfix

no-filtered-results

screwfix-top-tradesperson

Screwfix Top Tradesperson

gallery-of-links---pfx

screwfix-config

accessibility

Accessibility

policy-links

POLICY LINKS.

mastercard

Mastercard

trade-uk-card

Trade UK Card

Home

trade-credit-account

Trade Credit Account

screwfix-rewards

Screwfix Rewards

electricfix

Electricfix

rate-review

Rate & Review

header

screwfix-key-accounts

Screwfix Key Accounts

help-contact

Contact Us

CLICK & COLLECT

cookie-policy

Cookie Notice

screwfix-sustainability

Screwfix Sustainability

DELIVERY IN AS LITTLE AS 20 MINUTES

modern-slavery-statement

Modern Slavery Statement

google-pay

Visa

paypal

Paypal

more-from-screwfix---pfx

gallery-of-links---efx

delivery

Delivery

careers-at-screwfix

Careers at Screwfix

customer-services

CUSTOMER SERVICES

apple-pay

screwfix-live

Screwfix Live

amex

Amex

electricfix-logo

Return to Screwfix.com homepage

visa

about-us

About Us

gallery-of-links

plumbfix-logo

screwfix-trade-apprentice

Screwfix Trade Apprentice

product-safety-notices-recalls

Product Safety Notices & Recalls

screwfix-foundation

Screwfix Foundation

trade-link

Trade Link

next-day-delivery-available

EASTER OPENING HOURS

energy-labels

Energy Labels

screwfix-logo

more-from-screwfix---efx

screwfix-gift-card

Screwfix Gift Card

{{page-header}} | {{parent-category}} | Screwfix

buying-guides

Buying Guides

black-friday

Black Friday

weee--battery-recycling

WEEE & Battery Recycling

refurbished-products

Refurbished Products

screwfix-app

Screwfix App

terms-conditions

Terms & Conditions

trade-focus

Trade Focus

media-centre

Media Centre

Cromar Vent3 Classic Waterproof Roofing Membrane Grey 50m x 1m (503HA)

Cromar Vent3 PRO Waterproof Roofing Membrane Light Green/White 50m x 1m (109HA)

Cromar Vent3 Waterproof Roofing Membrane Blue Upper Surface 50m x 1m (928HA)