Catnic TH90/100 Heavy Duty Thermally Broken Cavity Lintel 90-105mm by Catnic Catnic TH90/100 Heavy Duty Thermally Broken Cavity Lintel 90-105mm by Catnic
Catnic 150mm Cavity Part L Heavy Duty Lintel 1350mm TH150/1001350 by Catnic Catnic 150mm Cavity Part L Heavy Duty Lintel 1350mm TH150/1001350 by Catnic
Catnic TH90/100 Heavy Duty Thermally Broken Cavity Lintel 90-105mm by Catnic
Catnic 150mm Cavity Part L Heavy Duty Lintel 1350mm TH150/1001350 by Catnic
Lintel Type : Cavity Lintels
Cavity Width : 90-105mm
Lintel Duty : Heavy Duty
Thermally Broken : Yes

Catnic

Catnic TH90/100 Heavy Duty Thermally Broken Cavity Lintel

£145.00
Cavity Lintel

£145.00 (ex VAT)

Length

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The Catnic TH90/100 Heavy Duty Thermally Broken Cavity Lintel is designed for masonry cavity walls with a 90–105mm cavity, a 100–115mm inner leaf and a 100–102mm outer leaf. Its fully insulated, open-back profile incorporates a complete thermal break between the masonry leaves to help reduce heat loss around openings. We supply five lengths from 1350mm to 2250mm, with safe working loads of 32kN, 48kN or 45kN depending on length.

Catnic TH90/100 key features

Complete thermal break

Separates the inner and outer steel sections to reduce thermal bridging at the window or door opening.

Heavy duty performance

Supports specified masonry, timber floor and roof loads, with published safe working loads up to 48kN.

90–105mm cavity walls

Designed for a 100–115mm inner masonry leaf and a 100–102mm outer leaf.

Continuous insulation

Fully insulated construction helps reduce heat loss through the lintel and contributes to improved junction performance.

Open-back profile

Allows masonry to be built continuously on both leaves and accommodates fair-faced inner leaf masonry.

Integral plaster key and protective finish

Includes an integral plaster key and Catnic's Duplex corrosion protection with black polyester powder coating.

Dimensions and specification

Catnic TH90/100 technical specifications
Manufacturer Catnic
Product code TH90/100
Lintel type Heavy duty thermally broken cavity wall lintel
Cavity width 90–105mm
Inner masonry leaf 100–115mm
Outer masonry leaf 100–102mm
Lengths we supply 1350, 1500, 1650, 2100 and 2250mm
Nominal section height 154mm or 229mm, depending on length
Nominal end bearing 150mm at each end
Safe working load 32kN, 48kN or 45kN, depending on length
Thermal break Complete, with integral insulation
Plaster key Integral
Damp-proofing Separate DPC tray required
Finish Duplex corrosion protection with black powder coating

Catnic TH90/100 lengths and safe working loads

The TH90/100 is available from us in five lengths. The table below shows the manufacturer's published safe working load, nominal weight and section height for each size.

TH90/100 lengths, loading capacities, weights and heights
Length SWL Weight Height
1350mm 32kN 17.96kg 154mm
1500mm 32kN 19.95kg 154mm
1650mm 32kN 21.95kg 154mm
2100mm 48kN 35.09kg 229mm
2250mm 45kN 37.60kg 229mm

How does the TH90/100 reduce thermal bridging?

Conventional steel cavity lintels can provide a conductive path between the inner and outer masonry leaves. The Catnic TH90/100 uses a complete thermal break between its steel sections, together with integral insulation, to reduce this heat transfer at the opening.

Catnic reports independently verified Psi values of 0.02–0.05 W/mK for its thermally broken lintel range. The junction performance achieved in a particular building depends on the wall construction, insulation arrangement and installation details.

The TH90/100 also incorporates an integral plaster key for internal finishing.

Where to use the Catnic TH90/100

This heavy duty thermally broken lintel is suitable for specified masonry, timber floor and roof loading applications in 90–105mm cavity-wall construction. Its open-back profile allows masonry to be built on both leaves and is suitable for fair-faced inner leaf masonry.

Choosing the correct length

Catnic's published safe working loads assume nominal 150mm end bearings at each end. As a general starting point, allow 300mm beyond the clear structural opening to provide these bearings.

For example, a 1200mm clear structural opening would normally require a 1500mm lintel, providing 150mm bearing at each end. Check that the chosen length also meets the required load capacity.

Installation and damp-proofing requirements

Install the TH90/100 in accordance with Catnic's current instructions, ensuring suitable end bearings, temporary support where required, and correct masonry restraint and load transfer.

When TH and TX open-back lintels support concrete floors, Catnic requires the blockwork to be built tightly against the lintel's inner vertical face, with a mortar joint at the top of the blockwork to distribute floor-unit loads evenly over the inner flange.

The published safe working loads do not automatically establish suitability for every concentrated loading, floor or roof arrangement. Follow the project structural design and manufacturer guidance.

For standard duty thermally broken applications in the same cavity width, compare our Catnic TS90/100 and other cavity lintels.

If a complete thermal break is not required, our Catnic lintel range also includes conventional heavy duty cavity lintels.

Explore our thermally broken lintels for related products and cavity widths.

Technical downloads

Frequently asked questions

What is the Catnic TH90/100?

The TH90/100 is a heavy duty thermally broken steel cavity lintel for masonry walls with a 90–105mm cavity. It provides a complete thermal break between the inner and outer steel sections.

What cavity width is the TH90/100 designed for?

It is designed for a 90–105mm cavity, with a 100–115mm inner masonry leaf and a 100–102mm outer leaf.

What lengths do you supply?

We supply five TH90/100 lengths: 1350mm, 1500mm, 1650mm, 2100mm and 2250mm.

What is the safe working load of a TH90/100?

Our 1350mm, 1500mm and 1650mm lengths have a published SWL of 32kN. The 2100mm lintel is rated at 48kN and the 2250mm lintel at 45kN, subject to Catnic's loading conditions.

Does the TH90/100 need a separate DPC?

Yes. Catnic specifies a separate DPC tray for the TH90/100. This is an important difference from some conventional Catnic cavity lintels that incorporate their own DPC.

What is the difference between the TH90/100 and TS90/100?

Both are thermally broken lintels for 90–105mm masonry cavities. The TH90/100 is the heavy duty model, whereas the TS90/100 is intended for standard duty loading applications. Select according to the calculated loads and Catnic's published data.

Can the TH90/100 support concrete floors?

Catnic provides specific installation instructions for TH and TX open-back lintels used with concrete floors. The blockwork must be tight against the inner vertical face, with a mortar joint at the top to spread floor-unit loads evenly over the inner flange. Confirm the loading arrangement with the structural design.
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Catnic TH90/100 Heavy Duty Thermally Broken Cavity Lintel 90-105mm by Catnic

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