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Norcros Rock-Tite Mortar Additive 12.5kg

SKU: 455100
In Stock
sale price £11.66
inc VAT


Norcros Rock-Tite Mortar Additive is a fibre reinforced cement mortar additive specifically designed to provide when mixed with sharp sand, a high strength mortar for bonding concrete, natural stone and porcelain paving slabs to both hardcore and solid bases.

Key Features

  • Just add sharp sand (6:1) & water
  • Norcros Life Time System Guarantee *when used in conjunction with Rock-Tite Primer and Brush in Grout
  • High Strength Bonding Agent & Fibre Reinforced
  • Includes Rock-Tite additives to improve performance & freeze/thaw resistance
  • Specifically designed for bonding concrete, natural stone and porcelain paving slabs to both hardcore and solid bases

Offering an incredibly simple and efficient method of fixing concrete, natural stone and porcelain outdoor slabs to both hardcore and solid screed bases, Rock-Tite Mortar Additive contains specially formulated Rock-Tite additives to improve performance, workability and freeze/thaw resistance of the finished mortar mix. Simply add sand and water, mix until a smooth, lump-free mortar with a creamy consistency is achieved, and apply, Please note that the back of all porcelain slabs must be primed using Norcros Rock-Tite Porcelain Primer ahead of fixing.

Product Details
Product Guides
  • SKU 455100
  • Suitable for Underfloor Heating No
  • Weight 12.50 KG

Product Reviews

Robert 28/10/23

Garden project

Pallet delivered on time and securely wrapped. A great sysrem for laying porcelain tiles.

Verified Buyer

Anonymous 24/06/22

Verified Buyer

Karl Y. 01/07/21

Great stuff

Our path is coming along nicley thanks to this project

Verified Buyer

Jeanette 02/06/22

Is this classed as slurry? And how many would we need for 24metres


Our advice: No, this is specifically designed for use with Porcelain slabs. 1 x 12.5kg bag of Mortar Additive (6:1 mix) will cover approximately 2m2 at 25mm thickness so you would require x12 bags.

Callum 23/04/22

The ratio 6:1 is that one bag to 6 shovel off sand.. and how many slabs could you lay with this ratio (per bag)


Our advice: The ratio would be 75kg sharp sand per 12.5kg bag. The coverage provided depends on how thick you plan to set the mortar.

Robert 18/04/22

How many bags to cover 16 square metres at 25 mm thick


Our advice: You would require x27 bags.

Tony 13/05/23

Hi can you just confirm is the 6:1 ratio 6 = Rock-tite mortar additive 1 = sharp sand? thanks


Our advice: The Mix ratio for this product is 6 parts Sharp Sand to 1 part Mortar Additive (75KG of Sharp Sand to every 12.5KG Rock-Tite Additive).

sam 09/06/23

can I use this instead of the Norcross Mortar? If mixed in with sharp sand to fix my patio porcelain tiles


Our advice: Yes, this product is designed to be used with sharp sand instead of regular cement when installing porcelain slab tiles.