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A mortar designed as an adhesive and base coat for wood fibre insulation boards.
This product is not available to buy online. Please contact us for pricing and more information.
Unless otherwise specified all products within Ireland should be delivered within 2-3 working days. Please contact us for delivery options outside of Ireland or if you wish to ship to Northern Ireland.
Our stock is primarily shipped by Fastway or via the pallet network depending on the total weight of the order. The delivery method will be automatically assigned and priced at checkout. All delivery prices include VAT.
Usage:
Roundtower Board Render is designed to be used as a backing coat to adhere insulation board to the background. The boards will still need a mechanical fixing to hold them in place, however this render will allow build-up of the insulation boards before fixing.
We advise application using a notched trowel to the whole back of the board.
Suitable for applications in construction where the binder strength is appropriate for the host background/surface.
Coverage:
A bag will cover approximately 2.9m2 @ 5mm as an adhesive.
A bag will cover approximately 2.4m2 @ 6mm as a base coat onto STEICO THERM wood fibre board.
Advantages:
Quality controlled production.
Consistency of mix ratio and working additions.
Improved workability of mortar, extended working and finishing time and reduced risk of shrinkage.
Mixing:
A 25kg bag of render will require 4.4 to 5.4 litres of clean potable water. The water addition will vary according to the application and desired consistency/workability of the mortar. Always avoid making the mortar too wet, as this can promote shrinkage issues, especially when used as a render.
For drum type mixers, it is essential not to overfill the mixer.
As a dry mixed material, it is possible that some settlement or separation may occur in the bag during transit; when mixing part bags, it is especially important that the dry contents are thoroughly blended prior to mixing with water.
Best Practice/Advised Mixing - First add 60 to 70% water of the total water into the mixer, followed by the render and turn the mixer on. Allow the mortar to mix until the water is thoroughly distributed, then add additional water to achieve desired consistency.
Mixing time - Mix for a minimum of 5 minutes, but for no longer than 10 minutes.
Other mix methods - We accept that it is generally site practice to add the water to the mortar, providing the mortar is well mixed and not too wet, this method will be sufficient.
Should additional water be needed after quenching to maintain workability, this can be added and mixed thoroughly through the mortar.
Once water has been added, Roundtower Board Render has an open time of at least 2 hours. Longer in colder weather.
In general, this will be determined by the purpose and application of the mortar.
We would expect appropriate preparation in accordance with best practice; where the surface is clean, free of dust and
other debris.
Where necessary the background should be adequately dampened to promote adhesion/bond with the host surface.
Dense impervious backgrounds/materials are unlikely to be very absorbent and require little to no dampening, whereas
more absorbent backgrounds/materials require adequate dampening in order to prevent rapid drying.
Whilst this product includes additions to try and mitigate these issues, best practice still needs to be followed.
A 25kg bag of render will require 4.4 to 5.4 litres of clean potable water. The water addition will vary according to the
application and desired consistency/workability of the mortar. Always avoid making the mortar too wet, as this can
promote shrinkage issues, especially when used as a render.
For drum type mixers, it is essential not to overfill the mixer.
As a dry mixed material, it is possible that some settlement or separation may occur in the bag during transit; when
mixing part bags, it is especially important that the dry contents are thoroughly blended prior to mixing with water.
Best Practice/Advised Mixing - First add 60 to 70% water of the total water into the mixer, followed by the render and
turn the mixer on. Allow the mortar to mix until the water is thoroughly distributed, then add additional water to achieve
desired consistency.
Mixing time - Mix for a minimum of 5 minutes, but for no longer than 10 minutes.
Other mix methods - We accept that it is generally site practice to add the water to the mortar, providing the mortar is
well mixed and not too wet, this method will be sufficient.
Should additional water be needed after quenching to maintain workability, this can be added and mixed thoroughly
through the mortar.
Once water has been added, Roundtower Board Render has an open time of at least 2 hours. Longer in colder weather.
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