Roundtower Marine LP8 MortarRoundtower Marine LP8 Mortar Roundtower Marine LP8 Mortar is a ready mixed natural cement mortar developed for building, bedding, and pointing masonry in marine and water bearing environments. Manufactured using Natural Cement and selected natural sands, it provides rapid strength development, excellent adhesion, and resistance to washout in damp, tidal, and submerged conditions. Marine LP8 is specifically designed for softer historic masonry where

Roundtower Marine LP8 Mortar

Roundtower Marine LP8 Mortar is a ready-mixed natural cement mortar developed for building, bedding, and pointing masonry in marine and water-bearing environments. Manufactured using Natural Cement and selected natural sands, it provides rapid strength development, excellent adhesion, and resistance to washout in damp, tidal, and submerged conditions.

Marine LP8 is specifically designed for softer historic masonry where compatibility is critical. Its lower compressive strength makes it particularly suitable for conservation projects, traditional stonework, and heritage structures exposed to coastal, tidal, or freshwater environments.

Technical Data

Key Benefits

Low Strength for Historic Masonry

Designed for softer stone and brickwork where stronger mortars may be unsuitable.

Water Resistant

Suitable for masonry exposed to:

• Saltwater
• Freshwater
• Tidal action
• Wetting and drying cycles

Rapid Set

Develops strength quickly, helping reduce the risk of washout in exposed conditions.

No Carbonation Required

Hardens hydraulically, allowing use in permanently damp and submerged environments.

Sulphate Resistant

Suitable for coastal and marine environments exposed to aggressive salts.

Portland Cement Free

Contains no Portland cement, synthetic polymers, or pigments.

Typical Applications

Why Use Marine LP8?

Marine LP8 is designed for projects where compatibility with historic masonry is more important than achieving high compressive strength. Its lower strength helps reduce the risk of damaging softer masonry while still providing the durability, water resistance, and rapid set associated with Natural Cement mortars.

This makes it particularly suitable for conservation work in coastal, tidal, and water-bearing environments where stronger marine mortars may be inappropriate.

Installation Overview

1. Surface Preparation

Substrates should be clean, sound, and free from loose material.

2. Mixing

Mix with clean water or clear seawater free from biological contamination, silt, and sand.

3. Application

Suitable for pointing, building, and bedding in marine and water-bearing masonry applications.

4. Protection

Do not apply below 5°C or above 30°C. Protect fresh work from frost, heavy rain, direct sunlight, and drying winds.

5. Storage

Store dry, covered, and protected from moisture and frost.