Limelite St Pauls Heritage Grout




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Limelite Heritage Grout St Pauls is ideal for grouting up voids in rubble fill masonry or stone walls, amongst other low pressure grouting projects that require a high fluidity, low strength grout.


  • Lime based, Portland cement free
  • Long term durability and flexibility
  • Factory supplied and quality controlled
  • Extremely high fluidity
  • Increases the durability of traditional structures
  • Suitable for low pressure injection grouting in listed and heritage buildings


Technical Data Sheet (pdf) Safety Data Sheet (pdf)

Product Description:

Limelite Heritage St. Pauls Grout is a low strength, lime-based grout designed to fill and stabilise voids in heritage structures. The grout is extremely fluid to allow maximum void fill and designed to replicate the properties of lime putty once cured. The grout is Portland cement free, breathable and salt resistant.

Extremely High Fluidity
Highly fluid enabling penetration into fine fissures and cracks deep within the substrate.

Stabilises structures while accommodating the natural movement of the structure.

Proven Performance
Limelite Heritage Grouts are trusted by conservation professionals and proven on high profile and challenging projects including the restoration of St Paul’s Cathedral, one of the most iconic buildings in London.

Responsibly Sourced
All of our products are manufactured in the UK and certified under BES 6001 Responsible sourcing. Tarmac was the first company within the cement and lime sectors to be awarded the BES6001 ‘Excellent’ rating across its entire product range.

Our bespoke solutions are something we are proud to offer, and it is the laboratory that makes them possible. Be it starting from scratch or using an existing product as the foundation, our team know where to start in tackling the product performance requirements of any project – and they keep testing until they achieve the perfect result.

Technical Data

Setting time: Min. 24 hours

Flow Cone Test Result (ASTMC939-01): 10 seconds

Yield: 17.62 litres per 15kg bag

Water/Solid ratio: 0.8 (12 litres per 15kg bag)

Compressive Strength (N/mm2)
7 days 28 days
0.5N/mm2 1.5N/mm2

Mixing Instructions

For best results Limelite Heritage Grout St Pauls should be mixed using a mechanical mixer, such as a bougee pan, colloidal mixer or a drill and paddle. 15kg of grout powder should be steadily added to 12 litres of cool, clean water, and mixed for 2-3 minutes until a smooth, homogeneous consistency is achieved.

Application Instructions

Limelite Heritage Grout St Pauls is designed to be pumped into place using suitable low-pressure injection equipment, such as helical screw, diaphragm or piston type pumps.

Clean Up & Spillages

Tools and equipment can easily be cleaned using water. Cleaning of tools and equipment should be carried out as soon as possible after application.