PRODUCTS
OUR STORY
Larsen Building Products have been established as the leading manufacturer of professional building products that deliver exceptional performance for all corners of the construction industry.
Founded in 1975 in Antrim, Northern Ireland, the company has grown from its humble beginnings of supplying admixtures to concrete plants into a powerhouse offering a diverse range of high-quality, high-performance products across multiple sectors throughout the UK and Ireland.
As a family run business, Larsen has steadily expanded its product portfolio, which now includes:
Today, Larsen is renowned throughout the construction industry for providing cutting-edge solutions to meet the diverse needs of the professional. 2025 marks a proud milestone in Larsen’s history when the company celebrates 50 years of excellence within the construction industry. Staying true to its core values of professionalism, performance, trust, expertise, reputation, and innovation; these principles have driven the company’s vision:
To provide customers with exceptional service and support while delivering quality products that meet the demands of the ever-evolving construction industry.
PRO FIBERFLEX™
TILE ADHESIVES
Larsen Professional Tile Adhesives incorporate Fibreflex™ Technology, reinforcing each adhesive with microfibre particles. This ensures optimal strength and adhesion across a diverse range of tile types, including large format tiles.
Larsen Professional Tiling Range includes S1 and S2 deformable tile adhesives that meet BS EN12004 standards, made from carefully chosen components such as polymers, sands, colours, textures and additives.
FIBERFLEX™ STANDARD SET+
• Fibreflex™ Reinforced Tile Adhesive
• Interior & Exterior Use
• Porcelain, Ceramic, Natural Stone Tiles
• Extended Open Time
• Large Format & Panel Tiles
CODE COLOUR SIZE PALLET
M452W20 WHITE 20KG 1 (64)
M452G20 GREY 20KG 1 (64)
™
FIBERFLEX™ STANDARD SET
• Fibreflex™ Reinforced Tile Adhesive
• Interior & Exterior Use
• Porcelain, Ceramic, Natural Stone Tiles
• Large Format Tiles
• Standard Setting Time
CODE COLOUR SIZE PALLET
M473W20 WHITE 20KG 1 (64)
M473G20 GREY 20KG 1 (64)
RAPID SET+
• Fibreflex™ Reinforced Tile Adhesive
• Interior & Exterior Use
• Glass, Mosaic, Porcelain, Natural Stone
• Fast Setting
• Extra Large Format & Panel Tiles
M451W20 WHITE 20KG 1 (64)
M451G20 GREY 20KG 1 (64)
RAPID SET
• Fibreflex™ Reinforced Tile Adhesive
• Interior & Exterior Use
• Ceramic, Porcelain, Natural Stone, Mosaic
• Fast Setting
• Large Format Tiles
CODE COLOUR SIZE PALLET
M450W20 WHITE 20KG 1 (64)
M450G20 GREY 20KG 1 (64)
SEMI-RAPID SET+
• Fibreflex™ Reinforced, Thixotropic Tile Adhesive
• Interior & Exterior Use
• Versatile Mixing with HydroGel Technology
• Porcelain, Ceramic, Natural Stone
• Extra Large Format & Panel Tiles
M454W20 WHITE 20KG 1 (64)
ULTIMATE RAPID SET
• Fibreflex™ Reinforced Tile Adhesive
• Interior & Exterior Use
• Fast Setting
• Green Screed
• Fixes Almost All Tile Types
M454G20 GREY 20KG 1 (64) CODE COLOUR SIZE PALLET
M453W20 WHITE 20KG 1 (64)
M453G20 GREY 20KG 1 (64)
Fiberflex™ Semi-Rapid Set + 3-20mm 3-12mm
Fiberflex™ Ultimate Rapid Set
STANDARD SET FLEX
Specially Formulated, High-Grab, Non-Slip, Polymer Modified, Cement-Based Tile Adhesive
• PERFECT FOR THICK OR THIN BED
• IDEAL FOR PORCELAIN AND NATURAL STONE TILES
• INTERIOR, EXTERIOR, FLOOR AND WALL APPLICATIONS
• SUITABLE FOR LARGE FORMAT PANELS
• FOR MORE DEMANDING AREAS, E.G. SWIMMING POOLS
FAST SET FLEX
• Ideal for Ceramic, Porcelain, Large Format, Natural Stone & Mosaic Tiles
• Interior & Exterior Use
• Floor & Wall Applications
• Perfect for Heated Screeds
SEMI-FAST SET FLEX
• Ideal for Large Format & Panel Tiles, Ceramic, Porcelain, Natural Stone & Mosaic
• Interior & Exterior Use
• Floor & Wall Applications
FAST SET
• Ideal for Ceramic & Porcelain Tiles
• Interior & Exterior Use
• Floor & Wall Applications
• Concrete & Screed Floors Only (No Underfloor Heating)
Flexible, Rapid Setting Tile Grout for Walls and Floors. With Colourfast Technology for consistent Joint Colour. Free From Efflorescence
• SUIT NATURAL STONE, MOSAIC AND GLASS)
• STAIN, MOULD AND WATER RESISTANT
• FINE TEXTURE AND SMOOTH FINISH
• INTERNAL AND EXTERNAL USE
COLOURFAST 360 10 SILICONE SEALANT
• Premium Quality, Low Modulus, Neutral Cure Silicone Sealant
• Sanitary & Construction Applications inc. Natural Stone
• Creates a Durable & Waterproof Seal
• Fast Curing
• Excellent Adhesion
• Highly Flexible
• Waterproof & Mould Resistant
IMPREGNATING SEALER
• Solvent-Based, Stain Resistant, Surface Protector & Colour Enhancer
• Advanced Impregnator
• Water Repellent Seal
• Enhanced Colour of Treated Surface
EXTRA STRENGTH REMOVER
• Strong Acidic Cleaner
• Removes Cement Stains
• Ideal for Stubborn Grout Residues
• Perfect for Use on Deeply Textured Tiles
SHOWERPROOF CERAMIC WALL TILE ADHESIVE
• Ready Mixed Thin Bed Adhesive
• High Grab, Non-Slip & Mould Resistant
• Fixes Ceramic Wall Tiles in Domestic Showers, Kitchens & Bathrooms
• BS EN 12004 D1T
STONE & GROUT PROTECTOR
• Water-Based Surface Protector Against Oil-Based Staining
• Advanced Stain Resistant Impregnating Sealer
• Invisible Protection
• Suitable for Almost All Porous Surfaces & All Natural Stone
THERMAL CONSTRUCTION BOARD
Multi-Purpose Construction Board Designed for the Application of All Tile Types, Cement Based Screeds and Synthetic Renders
Suitable for Floors, Walls, Ceilings & Counter Tops
• LIGHTWEIGHT & W
• REINFORCED CEMENT COATING
• EXCELLENT IMPACT STRENGTH
• SOUND REDUCTION
• FIRE RESISTANCE
TANKING KIT
Versatile multi-part system designed for ease of use and premium performance. Contains Water-Based, Flexible Tanking Membrane (4L), a roll of Self-Adhesive Butyle Tape (5m) & Acrylic Primer (0.5L).
• Ideal for Wet Rooms, Shower Areas, Sports Facilities & Bathrooms
RAPID TANK 360
Rapid Tank 360 is a versatile, fast-setting sealing slurry that adheres to mineral surfaces, offering watertight protection against water pressure. It is vapor-permeable, chloride-impermeable, frost-resistant and aging-resistant. Additionally, it serves as a CO2 barrier and can bridge cracks over 1mm, even in lower temperatures.
• Internal & External
• Rapid, Crack-Free Setting
TRADE WATERPROOFING KIT
Versatile multi-part system designed for ease of use and premium performance. Contains Water-Based, Flexible Tanking Membrane (4L), a roll of Flexible Joint Sealing Tape (5m) & Acrylic Primer (0.5L).
• Ideal for Wet Rooms, Shower Areas, Sports Facilities & Bathrooms
SCREWS & WASHERS
Larsen Thermal Construction Boards must be secured to the floor boarding with fixing washers and screws with a countersunk head.
• Ideal for Securing Thermal Construction Boards
• 50 Per Pack
Ideal for Natural Stone, Underfloor Heating, Timber Floors, Wet Rooms, Large Tiles, Heated Floors & Cracked Surfaces
WATERPROOF ANTI-CRACK MEMBRANE
• Low Profile (less than 1mm height build up), 3-ply Membrane (20m x 1m)
• Low-Profile Membrane (30 x 1m rolls)
• Manages Lateral Movements in Substrates
• Water-Vapor-Retarding Sheet (30m x 1m)
• 2 in 1 Waterproofing & Decoupling
• Accommodates Lateral Movement & Substrate Stresses
• Requires Less Adhesive (compared to ‘waffle’ decoupling mats)
• Suitable For Commercial & Residential Use
• 2 in 1 Anti-Crack & Decoupling System
• Requires Less Adhesive (compared to ‘waffle’ decoupling mats)
• Suitable For Commercial & Residential Use
• Suitable for Sealing Under Ceramic Tiles e.g. in Wetrooms & Balconies
Ideal for Shower Trays, Bathtubs & Counter Tops
SELF ADHESIVE TANKING TAPE
• For Domestic & Commercial Waterproofing
• Solvent-Free Flexible Joint Sealing Tape
• Tanks Tiles in Wet & Shower Rooms
• Designed for Interior Floor & Wall Use
TANKING MEMBRANE
• Solvent-Free Waterproof Sealing Compound
• For Professional Tanking Under Tiles
• Ideal for Wet Areas e.g. shower rooms
• Suitable for Interior Walls & Floors
• Touch Dry in just 1 Hour
FLEXIBLE SHOWER SEAL TAPE
• Hi-Performance Shower Seal Tape
• Apply Directly to Wall-Facing Edges
• Ensures a Reliable, Watertight Seal
FUSION XT PRIMING SLURRY
Primes Paving Slabs to Create an Essential Bond to Bedding Mortar. Perfect for Exterior Paving & Tiling.
• SUITABLE FOR PORCELAIN, NATURAL STONE, PRECAST CONCRETE, FLAGS & CLAY PAVERS
FUSION XT BRUSH-JOINT
Brush-In Jointing Compound for All Paving Types with Joint Widths of 3-20mm
FUSION XT BRICK-SLIP BOND
FUSION XT FINE-JOINT
Jointing Compound for All Paving Types with Joint Widths of 1-15mm
FUSION XT FLOW-JOINT SMOOTH
For Installing Brick Slips & Stone Cladding to a range of substrates
Brush-Joint
Flowable Jointing Compound for All Paving Types with Joint Widths of 3-50mm
PRIMER GRIP 360
The Ultimate Mechanical Key - This Hybrid Primer with a Gritty Surface Ensures a Superior Bond. Formulated With Advanced Polymers & Special Fine Aggregate.
• IDEAL FOR TILING AND LEVELLING
• RAPID DRYING
• FOR COMMON ABSORBENT & NON-ABSORBENT BACKGROUNDS
• TILE OVER OR LEVEL IN 15-20MINS
• 1KG PER 5-10M2
DPM ONE COAT RAPID
• 2 Part Epoxy Surface Applied Damp Proof Membrane
• Ideal for Fast-Track Applications
• Install Moisture Sensitive Floor Finishes Immediately Onto Damp Concrete & Screed
• Superior 1 Coat Application
• Up to 98%RH in 1 Coat
INJECTION RESIN
ACRYLIC PRIMER
• Ready-to-Use, Water-Based Polymer Emulsion
• For Porous Substrates
• Use Neat for Sealing, Diluted for Priming
• Improves Adhesion Prior to Tiling or Screeding
• Coloured to Indicate Application
NP KEYCOAT
• Ready-to-Use Universal Primer
• Use Prior to Tiling & Levelling
• Hi-Performance Water-Based Modified Polymer
• For Smooth, Non-Porous Substrates
• Low Viscosity Epoxy Resin Based Crack Injection System
• Solvent-Free & Very High Strength (80N/mm²)
• Bonds to Dry & Damp Surfaces
• Non-Shrink
• Ideal for Repairing Small, Fine & Hairline Cracks in Reinforced Concrete Structures
RAPID REPAIR CONCRETE RAPID REPAIR MORTAR
• Specially Formulated Cement-Based Patching Repair Compound
• Rapid Setting in 30 Mins
• Large & Small Repairs
• Up to 150mm Depth
• Easy Mixing
• Internal & External Use
• Ideal for Screeds, Pavements, Manhole Bedding & Floors
• Rapid Setting & Drying Cementitious Patching Mortar
• Ideal for Floors, Stairs & Steps
• Internal & External Use
• Easy Mixing
• Sets in 30 Mins
