Hessian Sheets & Rolls

Hessian fabric for the protection and aftercare of fresh lime or cement mortars and renders.

Key Benefits

  • Assists with the protection of lime mortars and renders from direct sunlight and drying winds
  • Can be kept damp to assist with keeping the relative humidity high next to the masonry
  • Robust and reusable
  • Available in multiple weights as full rolls or per metre

Pricing

£1.75£155.00

5% discount on orders over £500 (Excluding Vat & Delivery). For larger projects visit our pricing page.

Product Variations

Product OptionPrice (Ex VAT)
200gsm / 1.83m x Per Meter (add required): £1.75 £2.10 inc VAT
200gsm / 1.83m x 50m Roll: £77.86 £93.43 inc VAT
270gsm / 1.83m x Per Meter (add required): £2.55 £3.06 inc VAT
270gsm / 1.83m x 50m Roll: £113.19 £135.83 inc VAT
366gsm / 1.83m x Per Meter (add required): £3.50 £4.20 inc VAT
366gsm / 1.83m x 50m Roll: £155.00 £186.00 inc VAT
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Description

Hessian, sometimes referred to as Burlap, is a loose woven natural fabric made from fibres of the jute plant, it’s use is widespread in several industries. A very robust material that can withstand repeated wetting and drying without compromising its strength, and as such very common in the construction industry for the curing of concrete especially. In the context of lime mortars and renders, Hessian is the primary material of choice for aftercare.

Using hessian is a highly effective means of safeguarding fresh lime mortars or renders, functioning in multiple capacities. During the colder months, it acts as a frost blanket, shielding the mortar from the detrimental effects of freezing temperatures. When wetted down in the warmer months, it serves as a humidity cover, preventing the mortar from rapidly drying out, which is particularly crucial, as rapid drying is a common cause of failure in lime mortars. Additionally, it functions as a windbreak, minimizing the impact of wind-induced drying.

Hessians are categorised by their weight, expressed as ‘gsm’ or Grammes Per Square Metre with the lower number representing a more open weave to the fabric with less material used, hence it being lighter. Cornish Lime stock 3 grades: 200, 270 & 366 gsm (Grammes Per Square Metre). Available in full rolls measuring 50 x 1.8 Metres (151 x 6 feet), 50 x 1.37 Metres (151 x 4.5 feet) or by the metre cut from the roll, which will be slightly more expensive per meter.

200gsm – 200gsm is a lower weight and more open weave hessian, ideal for summer work or warmer weather conditions. Available as a 1.37m x 46m roll, 1.83m x 50m roll or per metre.

270gsm – 270gsm hessian is a medium weight and good all-around hessian, suitable for most applications. Available as a 1.37m x 50m roll, 1.83m x 50m roll or per metre.

366gsm – 366gsm hessian is a heavier and thicker weave, providing robust protection from adverse cold weather conditions, including wind chill and frost. Available as a 1.83m x 50m roll or per metre, how this is currently out of stock.


Application

Suitable for external use for lime or cement mortars and renders.

The duration required for using hessian depends on the strength of the lime used and environmental conditions. We always advise following best practices for curing and protecting fresh lime mortars and renders. For more guidance on curing and protection, see our helpful guide on curing lime renders and mortars.

Are you mixing onsite? Browse our range of lime and binders, or coarse and fine sands for traditional lime mortars and renders.

 

Each project is unique, always seek professional advice before undertaking a project.

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FAQs

Hessians are categorised by their weight, expressed as ‘gsm’ or Grammes Per Square Metre, with the lower number representing a more open weave to the fabric with less material used; hence it being lighter. At Cornish Lime, we stock three grades: 200, 270 & 366 gsm (Grammes Per Square Metre).

We always advise using Hessian with lime mortars or renders. The minimum required time depends on the strength of lime used and environmental conditions. As general guidance, hessian should be used for a minimum of ten days for stronger NHLs and no less than four weeks for non-hydraulic materials. The use of hessian is also critical in adverse weather conditions, such as high heat and drying winds or cold weather, especially if there is a risk of high windchill or frost. If working with lime in the winter, see our helpful guide, Tips for Winter Working with Lime.

When a lime mortar or render dries too quickly, issues can arise, including cracking, shrinkage, discolouration, debonding or friable surfaces. Lime requires moisture to develop strength to aid carbonation and strength development.

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