Plaster, Insulation and Dehumidifier all in one. Roundtower Insulating Plaster is a lightweight plaster which offers low strength, high flexibility, high vapour permeability and advanced thermal performance, for use on solid walled masonry.
Insulating Plaster has been specifically designed to reduce heat loss in solid walls and older buildings. Working as a lightweight base coat for rendering and plastering applications, Insulating Plaster offers significantly improved insulation and moisture management, as well as much faster application times compared to conventional lime renders.
Roundtower Insulating Plaster is designed to improve the thermal performance of solid walled masonry, whilst maintaining the high vapour permeability and low strength of an NHL 2 render. Insulating Plaster offers a viable solution for Part L1B legislation in that it meets the requirements for improving the thermal performance of a wall, whilst maintaining a permeable fabric which absorbs and readily allows for the evaporation of moisture and will not prejudice the character of the host building or increase the risk of long-term deterioration of the building fabric or fittings. With a measured K Value of 0.12, Insulating Plaster significantly outperforms similar systems both in terms of performance and cost. A 50mm application will improve the U value of a solid wall by 50% or more, significantly reducing heat loss.
Most available lightweight/insulating materials use aggregates that have a two-dimensional structure, when these are subject to pressure during application the aggregate can breakdown, reducing both the thermal performance and durability of the mortar. Roundtower Insulating Plaster uses a specialist recycled ultra-lightweight hardened aggregate with a three-dimensional structure, which does not breakdown under application and improves both the durability and insulating properties of the render.
Fibre additions improve the flexural strength of the plaster, distributing stresses across the render to help reduce point loading, and negate the need for any mesh to be applied to the wall or inserted within the plaster.
Insulating Plaster can also be used in sustainable construction projects as a basecoat onto natural building materials such as hemp, straw and rammed earth. The insulating properties help reduce the thermal expansion differentials between the background and any subsequent coatings.
For internal applications it can be applied as backing coat or through to finish coat, or finished with a lime plaster. For external applications, apply as a backing coat with Roundtower NHL2 Drymix as a finish.
Suitable for application onto most host surfaces. If working on weak/friable backgrounds such as cob, please contact us for further application information.
After mixing, a bag will produce approximately 13.8 litres of mortar. For quantity purposes, assume that for every 10mm depth, you would need 0.72 bags per square meter.
Please read the Roundtower Insulating Plaster DataSheet for full application information.
Each project is unique, always seek professional advice before undertaking a project.