Britannia Aquashield High Build
  • Britannia Aquashield High Build
  • Britannia Aquashield High Build
  • Britannia Aquashield High Build
  • Britannia Aquashield High Build
  • Britannia Aquashield High Build

Britannia Aquashield High Build


Britannia Aquashield High Build is an excellent waterproofer for exterior pitched or flat roofs: 

  • Ideal for bitumen, metal, fibreglass, porous and non-porous roofs, including asbestos cladding
  • Also suitable for concrete, brick, asphalt, iron and steel roofing materials
  • Excellent waterproofing for roofs
  • Contains added fibres that interlace to cover up small gaps or cracks
  • Suitable for general maintenance work
  • Gives you the peace of mind of instant waterproofing, even before it's dry!
  • Ready to use and works instantly
VAT excluded

£14.15 Tax incl.


The Britannia Aquashield High Build gives you the peace of mind of instant waterproofing, even before it's dry. Contains embedded fibres which will will cover up any small gaps and cracks, and is ideal for bitumen, metal, fibreglass, porous and non-porous roofs, including iron, steel, slate, polished brick, concrete and asbestos cladding.

Product Use in the Workplace

  • Library - If there's any building that can have its contents ruined by a leaking roof, it has to be a library. Even a small leak can cause a big problem; if water collects in one particular area of the roof, it has the potential to cause the ceiling to collapse, bringing a whole pool of water down all over the books.
  • Factory - Industrial roofs are usually hard-wearing, but like all roofing, needs to be well-maintained. In addition to not falling down, a good roof is one that keeps the rain and moisture out of the building. Once water can get in through the roof, it has the potential to cause erosion on metalwork, increasing the chance of damp and mould. By ensuring factory roofs are adequately waterproofed, safety can be upheld and damage can be avoided.

Features & Benefits

  • Excellent waterproofing for roofs.
  • Ready to use and works instantly.
  • Also great for asbestos cladding.
  • Contains added fibres that interlace to cover up small gaps or cracks.
  • Suitable for general maintenance work.
  • Solvent-based.
  • 2-year shelf life.

Preparation & Application

Ready for use on flat roofs, pitched roofs, weathered asphalt and bituminous surfaces, gutters, concrete, brickwork, GRP and fibreglass, felt and metal (galvanised and ferrous). Fibrous cement corrugated sheeting: two coats of Aquashield Primer must always be applied to this substrate. Clear all areas of moss, lichen and debris by brushing or power washing and remove surface water and any contamination such as Oil or Grease and allow to dry. Apply Britannia Fungicidal Wash to prevent further fungal/algal growth. Most roofing substrates to be treated will not normally require priming. To the dry and cleaned surface, apply a generous coat of Britannia Aquashield Waterproof Roof Coating by brush or squeegee, at the minimum specified spreading rate as stated above under the heading. Application Temperature should be between 5°C-25°C.

Please consult the Product Data Sheet for full application instructions.

Minimum Finished Fall: when using this product it is important that a minimum finished fall of 1:80 is achieved, as stated in BS 6229.2003 (Code of Practice for the application of Liquid Applied Waterproofing Systems to flat roofs with continuously supported coverings).

It is your responsibility to read the Product Data Sheets (available below) before you place an order and prior to application of the product. The content of this website is our best recommendation and is not advice. Coverage rates quoted are approximate, you agree that coverage depends on the condition of the substrate, surface absorption, texture and application method. We ALWAYS recommend a trial area is coated to ensure the product meets your requirements before use.

Product Details

Data sheet

Brush or Squeegee.
1-2kg per square metre, dependant on the substrate.
Touch Dry
Up to 6-7 days depending on temperature, thickness of coating. The product may remain soft for a further period depending on climatic conditions, this is not detrimental to the waterproofing qualities of the product.

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

questions Raymond James Morrison on 20/07/2019

Hi. I have a bitumen flat roof, it is good condition, however last year I noted thin cracks where appearing along the joint lines and as it is in full sun all day and I wanted to prolong its life I painted it with your Blackfriar Solar reflective paint. Having checked it this year its evident the cracking is again evident and I now thinking the Britannia Aquashield High Build, in solar white, would have been a more suitable product? can I apply this over the Blackfriars?


Please download the Product Data Sheet from the 'Attachments' tab on the Britannia Aquashield High Build product page. This details application to existing coatings and what to do on cracking areas. Should you require any further information please contact our Technical Team on 0113 2455450 (option 2) or email [email protected] 

questions Graham Pye on 26/03/2019

My lead clad bay window window flat roof approx 2.5m x1m has developed a small leak creating a disclouration on the ceiling below approx 10cm x 5 cm. Needless to say I cannot find the cause despite careful examination! The roof albeit old is generally in good condition. Rather than having a completely new lead roof I am considering painting with a waterproofing paint. Which - if any - of your products would you recommend? Many thanks for your help Regards Graham Pye Can you please


The Britannia Durashield system would be our recommendation for aged lead surfaces.

questions patrick on 22/02/2019

Hi. I have just had a bitumen flat roof recovered with a torch on mineral felt. Is there anyhing I can paint onto it to prolong it's life.One part of the roof gets a lot of sun and approx 1/2 of it is in the shade and suffers from a lot of moss.


Britannia Aquashield High Build could be used for this in Solar Reflective White, discolouration may occur over a new asphalt, tar or bitumen surfaces; therefore an extra coat may be required, for decorative purposes only.

questions gerald corns on 11/02/2019

I have a Garage that I erected myself about 2 years ago since then I have noting but problems with leaks. I tried all sorts of remedy's. My thinking is now to completely cover the whole roof with something. My garage is 17.7 sq mt Can you please advise me of a product that would do this your sincerely G Corns


You haven't said what your roof is - i.e. felt, metal, asbestos, etc. however if it is a substrate that Britannia Aquashield High Build can be applied to as per the product data sheet then this would be a good potential choice.

questions Jobn on 04/02/2019

Hi am looking for white waterproofing paint for the top of my land-rover defender 110 would this work. Many thanks John


We're assuming the surfaces you wish to paint are metal, if so Britannia Aquashield High Build can be used on metal surfaces. Be sure to download and read the product data sheet from the product page for full details on preparing and priming metal.

questions Daniel Needham on 13/12/2018

Hello, I have a polycarbonate conservatory roof which has flash banding on some parts. Can I use your aqua shield solar paint on these materials assuming they are clean and dry? Thank you in advance for your assistance.


We would recommend Britannia Aquashield Eco for this application.

questions Ryan Russell on 09/12/2018

I have a gutter between the 2 seperate pitched rooves of my house. Most is lead coated but the last and lowest 3 metres has been painted with something similar to your product but old and leaking slightly somewhere. Can I just clean, dry and paint over the leaky area with your product or will the old stuff need scraping off completely and starting again? Thanks.


Ideally we would recommend removing the existing coating to reveal the leaking area to enable you to prime, reinforce and coat the area as needed. If however this is not possible then as long as the existing coating is sound, well adhered and compatible then after cleaning Britannia Aquashield High Build could be applied directly.

questions Michael Johns on 06/12/2018

Hello, I have a workshop that has a corrugated metal roof some of which is in less than perfect condition, it would be difficult to remove and replace the roof and I am looking at alternative means of waterproofing it. Some of your products look as if they might be suitable, are you able to recommend any thing that might help. regards Michael Johns


After cleaning, assuming it is bare, weathered galvanised steel we would recommend first priming with Britannia One Pack Etch Primer before application of Britannia Aquashield High Build.


Question about the product

* Required fields
16 other products in the same category:

Eagle Desmopol T

Desmopol T, a single-component polyurethane resin for waterproofing roofs, terraces, balconies and overhangs, forming a continuous elastic without any joints or overlapping that is totally waterproof. Adapts to any surface, making it ideal for applications on uneven surfaces and in areas of any shape, whether curved or squared. Aliphatic...

Price £110.16
In stock

Coo-Var Solar Reflective Paint Aluminium

Coo-Var Solar Reflective Paint - Aluminium is a bituminous based aluminium paint used to deflect sunlight to reduce heat build up, inside and outside.  Product Features Can be used on stable felt, concrete, wood and brick Apply by brush or roller Bituminous-based aluminium paint Ideal for year-round use Extends the lifespan of roofing...

Price £49.19
In stock


GacoPatch is a flashing grade, standalone roof patch made with 100% silicone. ADVANTAGES New, improved technology One-step application limits costs Permanently flexible UV stable Will not chalk, crack or peel Vertical or horizontal application

Price £160.00
In stock

GacoPro Roof Coating

GacoPro Roof Coating is a professional grade, 150% elastic, 100% silicone roof paint for flat and pitched roofs. ADVANTAGES 20 years waterproof protection Year round application  Easy to apply by brush, roller or spray Protects against leaks, ponding water and severe weather Single pack Apply directly Competitive price More benefits...

Price £97.00
In stock

Tor Elastaseal Z Top Coat

Tor Elastaseal Z Top Coat (RC141) is a cold applied single pack, ultra high solids moisture activated elastomeric urethane coating free from solvent odour. A high build, heavy duty coating, free from solvent odour, that provides durable, long term protection for flat and pitched roofs. To be used as a fully reinforced weatherproofing system.

Price £250.00
In stock

Blackfriar Professional Solar Reflective Paint Aluminium

This product is temporarily out of stock due to a manufacturer shortage - We expect to see it return in September/October 2019. In the meantime we can recommend Coo-Var Solar Reflective Paint Aluminium as a great alternative. Blackfriar Professional Solar Reflective Paint Aluminium is a blend of rubber, polymer modified bitumen, aluminium and...

In stock

Rust-Oleum Mathys Dacfill HZ

Rust-Oleum Mathys Dacfill HZ is a 200% elastic water-based flat-roof system with a built-in fleece that is waterproof, vapour permeable and resistant against ponding water. Works after only an hour! Resistant to UV radiation, acid rain, heat, frost and pollution  Easy to apply with brush, roller or airless spray  Self-extinguishing...

Price £153.46
In stock

GacoFlex WalkPad Granules

Roofs become slippery when wet and extreme caution should be exercised when accessing any roof area for maintenance. GacoFlex WalkPad Granules complete the GacoFlex SF2036 WalkPad walkway system providing a traction enhancing textured surface.

Price £19.00
In stock

Britannia Aquashield Smooth

A highly effective waterproof roof coating that is ready to use and works instantly. For use on roofs, this smooth coating can be applied by brush, roller or squeegee:  Suitable for flat roofs, pitched roofs, weathered asphalt and bituminous surfaces, gutters, concrete, brickwork, fibreglass, felt and metal (galvanised and ferrous)...

Price £11.79
In stock

Tor Elastaseal Z Accelerator Solution

Tor Elastaseal Z Accelerator Solution (RC143) is a single pack coloured, solvent thin additive for use in conjunction with 12.5 litre units of Tor Elastaseal Z Embedment Coat (RC140), Elastaseal Z Top Coat (RC141) and Elastaseal Z Fibretex (RC142) to accelerate cure and enable faster return to service of the roof.

Price £15.00
In stock

GacoFlex SF2036 WalkPad

GacoFlex SF2036 WalkPad is a stay-put solution for creating highly-visible rooftop walkways. It is an exceptionally durable, silicone-based, solvent-free coating that is combined with a reinforcing agent to provide exceptional durability and resistance to traffic and tears.

Price £397.00
In stock

Bullet Roof Mono

Bullet Roof Mono is formulated to the highest specification and can be applied over almost any surface with or without full reinforcement dependent on performance/specification requirements and can achieve life expectancies of up to 25 years. Top Features Moisture cured allowing application in most weather conditions. Excellent adhesion...

Price £52.50
In stock

Everbuild 906 Bitumen Roofing Emulsion

A flexible, water based bitumen roof coating which can be applied to damp surfaces, specifically designed for overcoating leaking flat and pitched roofs but can also be used for general waterproofing, metal protection and as an insulator.

Price £84.12
In stock

Britannia Aquashield Eco

Britannia Aquashield Eco is an elastomeric, solvent-free waterproofing coating. Suitable for general maintenance work, it needs just one coat to provide a durable, water-resistant finish. Advantages Eco-friendly Water-based Can be used on asbestos cladding

Price £13.06
In stock

Britannia Durashield

Specially-developed with refurbishment and overlaying in mind, Britannia Durashield is a great choice for roof repairs and restoration of a large variety of roofs. Flexible, highly elastic single-pack coating with excellent adhesion to almost any wall or roof substrate. Advantages Rubber solvent-based. Water-repellent. Excellent UV...

Price £54.68
In stock

Everbuild 907 Solar Reflective Aluminium Paint

A fast drying, solvent based, light and heat reflective paint to protect and prolong the life of roofs and roof repairs. A thin bituminous-based aluminium protective paint of brushing consistency which dries to a silvery finish.

Price £109.06
In stock