Baumit NHL Thermo is a natural white insulating lime render formulated with lightweight mineral aggregates to reduce thermal conductivity while maintaining excellent breathability. Suitable as a base coat on masonry, stone, brick and compatible insulation boards, it is ideal for renovation, conservation work and energy‑improved lime systems.

Lightweight natural hydraulic lime (NHL) base coat render for internal and external use, designed to provide improved thermal performance and high vapour permeability.

Its open‑pore structure helps regulate internal humidity, making it well suited to traditional buildings, moisture‑sensitive substrates and areas requiring enhanced thermal comfort. NHL Thermo can be finished with Baumit lime top coats or fine finishing plasters as part of the Baumit Klima and ecological building range.

• Lightweight insulating NHL lime render
• Suitable for internal and external applications
• High vapour permeability for healthy building fabric
• Ideal for renovation, conservation and energy‑improved lime systems

Product Details

• Packaging: 25 kg bag Shelf life: 12 months
• Consumption: approx. 4.0–5.0 kg/m² per 10 mm
• Yield: approx. 1.5–1.8 m²/bag at 10 mm
• Water demand: approx. 6.0–7.0 litres per 25 kg
• Thermal conductivity (λ): approx. 0.11 W/mK
• Max. grain size: 0–2.0 mm

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High‑performance extruded polystyrene (XPS) insulation boards for plinths, splash zones and below‑ground perimeter applications.

Plinth & Perimeter  boards are engineered for areas exposed to moisture, frost and mechanical loading, providing a robust thermal layer around the building perimeter. Their closed‑cell structure delivers exceptionally low water absorption, high compressive strength and long‑term thermal stability — ideal for insulating foundations, basement walls, slab edges and exposed plinth zones.

The boards can be installed against waterproofed masonry, concrete or insulation systems, and are suitable for both new build and retrofit. Their precision‑cut edges ensure tight joints, while the durable surface resists impact and site handling.

• Closed‑cell XPS insulation for plinths, splash zones and below‑ground use

• Extremely low water absorption and high freeze–thaw resistance

• High compressive strength for ground contact and backfilled areas

• Dimensionally stable, rot‑proof and resistant to soil moisture

• Compatible with Soprema waterproofing and façade systems

Available sizes:

600mm x 1250mm – 40mm boards are supplied as individual sheets, mainly for perimeter insulation for Limecrete floors.

Installation is straightforward, with boards easily cut to size and applied to surfaces. They can be used in conjunction with other systems for enhanced insulation and are compatible with various finishes.

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Lime filler for repairing existing internal surfaces, available in two different grades:

• 1 kg (Fine) – Suitable for hairline cracks
• 1 kg (Coarse) – Suitable for dents in existing plaster

Deeper/larger holes or patching in should be done using premixed lime mortar.

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Made in Cumbria, our lime plaster (Eden Skim Coat) is produced via the hot mix method. Mixed at ratio of 2:1 (sand:quicklime).

Lime plaster is a traditional internal finishing plaster, applied over base coats of lime mortar or insulated lime. Can also be used for skimming onto plasterboard, for this the boards would need to be primed first with Baumit Premium Primer (DG27).

The lime plaster should be applied at less than 2mm coats at anyone time, a second pass can be done 2-3 hours later (this depends on temperature and humidity in the room)

Coverage:

22kg bucket covers approximately 4-5m² (allowing for 2 x 2mm passes)

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Made in Cumbria, our lime mortar is produced via the dry slaked hot mix method. Mixed at ratio of 3:1 (sand:quicklime) and supplied unhaired.

The lime mortar is used for backing coats of lime plaster and lime render, scratch coats will need hair or fibres adding to the mix when knocking the mortar back up for reinforcement. Also used for internal and external building/bedding, pointing and parging/torching (add a Pozzolan for external use or damp internal conditions).

For internal final finish see Lime Plaster (Eden Skim Coat).

Lime Mortar Colour Options (for pointing)

Three colour options are available as premixed lime mortars, these would just need to be knocked up before use and pozzolan added if needed:

• 1 Eden Standard – Nosterfield sharp sand and -3mm kibble quicklime
• 2 Eden Fine Yellow – Appleton Yellow sand blended with limestone dust and -3mm kibble quicklime
• 3 Eden Fine Red – Red plastering sand blended with limestone dust and -3mm kibble quicklime

Colour Examples

                     1 Eden Standard                                        2 Eden Fine Yellow                                       3 Eden Fine Red

Lime Mortar Coverage:

• Render/plaster scratch coats @15mm thick = 39kg/m²
• Render/plaster float coats @10mm thick = 26kg/m²
• Re-pointing stonework = Approximately 26kg/m²
• Re-pointing brickwork (assuming 10mm wide x 20mm deep joint) = Approximately 8kg/m² (including 10% waste)
• Brick laying – 1000kg of mortar will lay 900-1000 bricks (no waste allowed)
• Stone bedding – 1000kg of mortar will bed approximately 5 m³ of stone
• Roof parging/torching – Approximately 22kg of lime mortar (dependent on slate & lath).

Pozzolan

Argical-M 1000 Pozzolan is helpful when applying hot lime mixes in damp, frost prone or exposed locations. The addition of Argical to hot lime mixes will increase compressive strength which helps to offer additional protection during the carbonation period.
Traditionally, volcanic ash, brick dust and other forms of burnt clays were used as additives in hot lime mixes and today this is refined in the form of Argical-M 1000. The term ‘pozzolan’ originates from the Italian town of Pozzuoli where volcanic ash was added during Roman times.

We recommend adding a pozzolan between 5% – 10% by volume depending on the time of year, exposure and use.

Quantity required for gauging into pre-mixed mortars:

• 5% by volume (1/20) – One tonne of mortar requires 12.5kg of Argical-M 1000
• 10% by volume (1/10) – One tonne of mortar requires 25kg of Argical-M 1000

Quantity required when making hot mix mortars on site:

• 5% by volume – For every measure of Quicklime added to the mix, add approx 20% of the same measure of Argical-M 1000
• 10% by volume – For every measure of Quicklime added to the mix, add approx 40% of the same measure of Argical-M 1000

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How to Apply:

• Apply using a notched trowel appropriate to tile size.
• For large tiles or uneven backs, use the double buttering method to ensure full coverage.
• Beat tiles gently with a mallet to bed them firmly into the adhesive.
• Allow 24 hours before grouting or foot traffic.
• Recommended working temperature: between 5°C and 30°C.

Coverage:

Coverage varies depending on tile size and trowel notch:
• Approx. 3.5 to 8 kg/m².

Advantages:

• Cement-free and breathable—ideal for lime screeds and traditional substrates.
• Excellent adhesion and extended open time (C2E classification).
• Compatible with Saint Astier Kholao Joint for a fully breathable system.
• Suitable for conservation and restoration work.
• Helps regulate moisture and prevents trapped damp.

Curing and Storage:

• Store in a dry place. Shelf life: 12 months in unopened packaging.
• Protect freshly laid tiles from frost, direct sun, and heavy rain during curing.

Health & Safety:

• Wear gloves and eye protection during mixing and application.
• Avoid inhalation of dust. Refer to safety data sheet for full guidance.

Declaration:

Saint Astier Kholao Colle meets the requirements for natural building materials and is manufactured under strict quality control using Saint Astier’s renowned natural hydraulic lime.

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Introducing Pavawall GF XL, an innovative render/plaster compatible insulation board designed for exterior facades. Crafted from natural and ecological woodfibre, this board is not only environmentally friendly but also boasts a high heat accumulating capacity, making it an ideal solution for protection against summer heat. Its convenient size ensures easy and quick application, perfect for both timber framework and exterior masonry facades.

Available in a range of thicknesses from 40 mm to 160 mm, Pavawall GF XL is versatile enough to meet various insulation requirements. The board’s tongue and groove edge profile contributes to a seamless installation process, while its dimensional stability under diverse conditions guarantees long-lasting performance.

Because the board is a plaster carrier it is ideal for EWI, IWI and internal roof installations.

Pavawall Key Features:

• Natural and Ecological: Made from sustainable woodfibre.
• High Heat Accumulation: Offers excellent protection against summer heat.
• Easy Application: Convenient sizes for quick installation.
• Versatile: Suitable for timber framework and masonry facades.
• Range of Thicknesses: Available from 40 mm to 160 mm to suit different needs.
• Stable: Excellent dimensional stability for enduring efficacy.

For the best results, always consult local regulations and installation guidelines, as well as the manufacturer’s recommended render systems. Store the insulation boards on a flat surface, keep them dry, and protect them from direct sunlight.

Pavawall is a testament to the commitment to providing high-quality, sustainable building materials that contribute to a greener future.

Technical Specifications:

• Edge Profile: Tongue and groove for easy installation.
• Density: Ranges from 130-165 kg/m³, providing a sturdy and reliable insulation layer.
• Thermal Conductivity: A lambda value (λd) of 0.040-0.043 W/(mK), ensuring effective thermal insulation.

**IMPORTANT** – Please note:

Wet, damaged, deformed or soiled insulation boards must not be installed. The PAVAWALL GF XL panels do not act as a rain screen during the construction phase for the ETICS work in question, they must therefore be protected from bad weather. If there is a risk of exposure to the weather, the panels must be effectively protected (e.g. by installing a rainscreen in front of the scaffolding) until the work is completed.

Panels stored on site must be protected from the elements with a tarpaulin, or a clean and tight pallet cover. PAVAWALL GF XL panels must be coated within 2 months of installation.

Thermal insulation both in summer and in winter

One advantage that is particularly noticeable in winter: thanks to the woodfibre, the home retains its comfortable warmth for a long time, because the extraordinary thermal-insulating characteristics of woodfibre materials avoid heat loss. The natural porosity and the composition of the fibres make the wood a particularly effective insulator.

Thanks to the woodfibre you can enjoy a mild temperature even on hot days. The attics in fact tend to heat up a lot in summer because the roof captures the warmth of the sun on a very large surface. Woodfibre board products have a higher weight than, for example, glass wool and can offer greater resistance to solar radiation (greater heat storage capacity). The daytime heat is then released only in the evening hours, cooler.

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Hempcrete is an amazing natural building material with many advantages unfortunately, there have traditionally been several issues which have restricted its wider use, such as requiring specialist knowledge, inconsistent supply and ultimately higher cost.

We have resolved these issues by using hemp blocks, which require no specialist skills or equipment, and by Partnering with Senini we have secured a regular high-quality supply, making the blocks more cost effective and available for more general use.

Why Build with Hemp Blocks?

Hemp Block Uses:

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Introducing Isolair Multi, a versatile and eco-friendly woodfibre insulation board that offers a range of benefits for both modern and traditional construction.

Isolair Multi is a high-performance, vapour-permeable, and water-resistant woodfibre board designed for a variety of applications, including sub-roofs, ventilated facades, and as a base for cladding, tiling, plaster, and render. Its robust construction allows it to withstand exposure to the elements for up to three months, making it an ideal choice for construction projects that require a durable temporary roofing solution.

Key Features:

• Vapour Permeability: Enhances moisture regulation within the building envelope, reducing the risk of trapped moisture and subsequent damage to the building fabric.
• Water Resistance: Complies with EN 14964, ensuring reliable protection against rain and wind.
• Fire Resistance: Offers proven fire resistance, contributing to the overall safety of the structure.
• Sound Protection: Its unique fibre structure provides excellent sound insulation, keeping external noise at bay for a peaceful indoor environment.
• Sustainability: Made from unused wood from manufacturing mills, Isolair Multi supports low energy use and maintains a positive CO2 balance.
• Thermal Buffering: Protects against summertime overheating with decrement delays, ensuring a consistent and comfortable indoor temperature.
• No Harmful Additives: Manufactured without the use of formaldehyde or other VOCs, making it safe for both the environment and human health.

Technical Specifications:

• Edge Profile: Tongue and groove for easy installation.
• Density: Ranges from 145-200 kg/m³, providing a sturdy and reliable insulation layer.
• Thermal Conductivity: A lambda value (λd) of 0.041-0.044 W/(mK), ensuring effective thermal insulation.

Isolair Multi is not just an insulation product; it’s a commitment to environmental sustainability and building health. Whether you’re constructing a new home or retrofitting an existing one, Isolair Multi offers a natural, efficient, and responsible way to insulate your space.

Thermal insulation both in summer and in winter

One advantage that is particularly noticeable in winter: thanks to the woodfibre, the home retains its comfortable warmth for a long time, because the extraordinary thermal-insulating characteristics of woodfibre materials avoid heat loss. The natural porosity and the composition of the fibres make the wood a particularly effective insulator.

Thanks to the woodfibre you can enjoy a mild temperature even on hot days. The attics in fact tend to heat up a lot in summer because the roof captures the warmth of the sun on a very large surface. Woodfibre board products have a higher weight than, for example, glass wool and can offer greater resistance to solar radiation (greater heat storage capacity). The daytime heat is then released only in the evening hours, cooler.

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PAVADRY is a natural and ecological, thermal insulation board based on wood fibre bonded with an 11 mm OSB3 zero board for dry fit installation. The hygroscopic properties of the wood fibre, ensure a controlled moisture buffering which prevents the formation of damaging moisture. Always consult the local regulations and installation guidelines as well as the manufacturer’s recommended render systems.

Multi-layer insulation board
Moisture buffering properties for a pleasant indoor environment
OSB3 has zero added formaldehyde

Characteristics insulating board

Density [kg/m3 ] 145
Thermal conductivity (λd) (EN 13171) [W/(m.K)] 0,041
Specific heat capacity (c) [J/(kg.K)] 2100
Water vapour diffusion resistance coefficient (μ) [-] 3
Reaction to fire (EN 13501–1) E
Compressive strength at 10 % deformation [kPa] 100
Edge profile straight

Characteristics OSB board

Density [kg/m3 ] 600
Thermal conductivity (λd) [W/(m.K)] 0,13
Specific heat capacity (c) [J/(kg.K)] 1700
Water vapour diffusion resistance coefficient (μ) (EN 12524) [-]
(wet cup) 150
(dry cup) 240

Storage

Store the insulation boards on a flat surface, keep dry and protected from sunlight. Stack no more than 4 pallets on top of each other.

Thermal insulation both in summer and in winter

One advantage that is particularly noticeable in winter: thanks to the woodfibre, the home retains its comfortable warmth for a long time, because the extraordinary thermal-insulating characteristics of woodfibre materials avoid heat loss. The natural porosity and the composition of the fibres make the wood a particularly effective insulator.

Thanks to the woodfibre you can enjoy a mild temperature even on hot days. The attics in fact tend to heat up a lot in summer because the roof captures the warmth of the sun on a very large surface. Woodfibre board products have a higher weight than, for example, glass wool and can offer greater resistance to solar radiation (greater heat storage capacity). The daytime heat is then released only in the evening hours, cooler.

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