Roundtower Marine LP8 Mortar

€28.60 INC VAT

€23.25 EXC VAT

Fast-setting natural cement / NHL mortar for marine masonry in splash, tidal and submerged zones.Natural buff-tan finish. Supplied in 25 kg polythene-lined, batch-coded paper bags (palletised). What it is Dry, ready-mixed blend of Prompt Natural Cement, NHL 5, selected natural sands...

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Fast-setting natural cement / NHL mortar for marine masonry in splash, tidal and submerged zones.
Natural buff-tan finish. Supplied in 25 kg polythene-lined, batch-coded paper bags (palletised).

What it is

Dry, ready-mixed blend of Prompt Natural Cement, NHL 5, selected natural sands and minor additives for workability.
Delivers an NHL5-grade strength with an accelerated fast set to resist tidal washout.
Higher strength than LP6 while retaining compatibility with most historic masonry when detailed and cured correctly.
No Portland cement and no synthetic polymers.

Performance at a glance

Working/open time: ~72 minutes at 17 °C (ambient and substrate suction dependent).
Set behaviour: Rapid initial grab for exposed and submerged work; strength develops with proper curing.
Breathability & compatibility: More sympathetic than rigid PC-rich mixes; choose LP8 when you need NHL5 strength + fast set.

Choose LP8 for tidal/splash and submerged repairs needing NHL5 strength and quick set.
Choose LP6 for a lower-strength fast-set in similar exposures.
Choose L4 for above-water, cement-free, slower-setting work prioritising maximum vapour permeability.

Typical uses

Quay and harbour walls, bridge abutments, revetments, coping stones, lock chambers and culverts in freshwater or saltwater.
High-exposure bedding and pointing where washout risk is significant.

Coverage & yield

25 kg → Approx14.5 L fresh mortar.
Approx. 1.5 m² of joint at 10 mm depth (actual yield varies with joint width/depth and substrate texture).
On-site trials recommended to confirm consumption.

Application essentials

Prep: Rake out to sound arrises; remove salts/bio-growth. Pre-dampen.
Mix: Add clean water gradually to a cohesive, plastic consistency; avoid over-watering.
Place/Finish: Compact fully; finish once the mortar begins to firm.
Curing & protection: Protect from rain, sun, drying winds and active washout through initial set; continue gentle curing thereafter.
Temperature window: +5 °C to +30 °C (consider wind-chill/radiant heat). Avoid if freezing is forecast during early cure.

Colour & batching

Natural, pigment-free buff-tan; final tone varies with curing and exposure. Custom colours not available.
For colour-critical projects, seek curing guidance and order sufficient material from a single batch

Deliveries within Ireland take between 2-5 working days after an order has been placed.

Our stock is shipped by Fastway, DPD or The Pallet Network depending on location and quantites. If your order contains a mix of products they will be dispatched altogether. The delivery will be determined by the product with the longest delivery time.

If for any reason we are out of stock of any item that you have ordered we will contact you to advise you of an anticipated delivery date, give you the option of any alternative product or the option to cancel the order, and receive a full refund.

Special orders, paints, plasters, NHL's and insulation products are non-refundable.

Deliveries carried out by TPN (The Pallet Network) are completed with 20 Ton Rigid Trucks that have a tail lift and a pallet truck. Open access will be required to facilitate the truck.

We always endeavour to take into consideration everyone's delivery needs.
Please ensure your delivery location has;
• Level area with no sharp inclines/declines.
• No Grass/Gravelled areas as pallets cannot be moved.
• Open access for Curtain sided Lorries.
• Whilst our drivers are instructed not to take their vehicle off the roadway to
make deliveries, our driver will make every effort with your delivery to meet your requirements.
• If you require the driver to leave the roadway, it will be at your own risk.
• Where a pathway is cemented / tarmacadam our drivers will do their best to bring a pallet to customers preferred drop on their premises.
• If it is gravel and not practical for a pallet truck to run on it, the driver is obligated to drop the pallet at nearest kerb side.
• The drivers are not obligated to place the pallets into stores, garages and a warehouses.

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