Shop|Mortars|Womersleys Coloured Mortars|Ironstone Flagstone Mortar 25kg

Ironstone Flagstone Mortar 25kg

From£10.95 + VAT

Ironstone Flagstone Mortar 25kg

From£10.95 + VAT
Fully Breathable and Durable natural lime mortar for repointing & construction in 25kg bags
Product Name
25kg Bag
12kg Tub
Ton Bag (5-7 days lead time)
40 Bags
out of stock

Ironstone Flagstone Mortar 25kg

Factory blended Natural Hydraulic Lime Mortar with an eminently strong NHL 5 binder from Socli blended with kiln dried Grit and River sand, which are 4mm down. The sands are prewashed to remove sediment before being dried and the result is a very workable mortar with reduced risk of shrinkage.

Ironstone Flagstone mortar uses Socli Natural Hydraulic Lime as it is one of the strongest NHL5’s available and ensures the mortar is resistant to foot traffic and adverse weather conditions.  The flagstone mortar is batch blended for consistency, naturally coloured and the aggregates provide a unique and robust texture.

Suitable in building conservation where a strong binder strength is required to protect the integrity of the flagstones.


After mixing, a 25kg bag will produce approximately 14 litres of mortar 


Before repointing remove all dust and loose material from joints. Dampen the area to be repointed first to help curing.


Mixing can take place in a tub or mixer. If you don't require the full amount of mortar just take out what's required and seal the remaining in a tub or bag. Use between 4-5 litres of clean water per 25kg or approx. 2 litres per 12kg Tub.

Add the water slowly, using just enough to achieve a workable mix. Lime mortars benefit from being left for 15 mins to fatten after mixing and can be reworked for up to 4 hours.

To ensure good compaction and adhesion the mortar can be tampered firmly with a bristle brush as it starts to firm up, normally after 4 hours, this process also brings the sharp aggregate to the surface creating a robust textured finish.

Ironstone Lime Mortar ensures:

  • Improved breathability
  • Protection of stone from frost and damp damage 
  • Long term durability
  • Reduced susceptibility to sulphate attack
  • Naturally flexibility reducing the chance of cracking