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Keystone BOX/K-100 Solid Wall Box Lintel 2850mm INS

SKU

KBX1285INS

£154.60 £128.83

Product Information

Keystone BOX/K-100 insulated box lintel, 2850mm (9ft 4in) length for solid walls 100-215mm thick.
Designed to carry full load of wet masonry immediately after installation, ideal for internal openings.
Enhanced thermal performance with built-in insulation (INS version) to meet modern building standards.
Requires minimum 150mm bearing each side, bedded on mortar for secure support.
Recommended to prop lintel during construction for faster, safer installation.

Details

The Keystone BOX/K-100 Solid Wall Box Lintel with insulation (INS) is engineered specifically for trade professionals working with solid wall constructions between 100mm and 215mm thick. This 2850mm lintel combines structural reliability with enhanced thermal efficiency, making it an excellent choice for supporting internal openings on serious projects where performance and compliance matter. Please note, lintels require correct bearing and bedding to ensure safety and effectiveness.

Application

This box lintel is designed to carry the full weight of wet masonry as soon as it is installed, making it suitable for internal load-bearing purposes such as over doorways and window openings within solid masonry walls. Its insulated core helps reduce thermal bridging, supporting energy-efficient builds without compromising structural integrity. Tradespeople should ensure a minimum end bearing of 150mm on each side, bedded firmly in mortar, and prop the lintel during construction to maintain alignment and speed up the build process.

Dimension

Length: 2850mm (9ft 4in)
Wall Width Compatibility: 100-215mm
Height: 215mm
Width: 95mm

Material

Steel box lintel with integrated insulation core
Suitable for use with solid masonry walls

Type

Box lintel for solid wall applications
Standard duty load-bearing lintel with thermal insulation (INS)

All product details are provided as a guide. For specific site requirements or further technical advice, please contact our sales office. Correct installation is vital to the lintel's performance and safety.

More Information

More Information
Type	Box Lintels
Loading	Standard Duty
Length	2850mm
Weight	37.250000
Manufacturer	Keystone
Sap Id	KBX1285INS

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Delivery Information

Delivery availability

We deliver to most mainland UK addresses. Some postcode areas are excluded – please see the full list below.

Delivery charges

Delivery costs vary depending on your location, the products ordered, and the delivery method selected. All delivery charges are calculated clearly at checkout.

Fuel Surcharge

Information on our added Fuel Surcharge can be found at https://condell-ltd.com/fuel-surcharge-notification

Delivery dates

You can request a preferred delivery date at checkout. While we aim to meet this wherever possible, availability may depend on stock levels and third-party delivery schedules. If your chosen date is unavailable, a member of our team will contact you to arrange an alternative.

Delivery method

All deliveries are made kerbside as standard. For health and safety reasons, drivers are unable to carry materials beyond the kerb. If you have specific access requirements, please contact us before placing your order.

Delivery exclusions

We currently do not deliver to the following postcode areas:

AB16, AB21–22, AB30–AB38, AB41–AB56, BT1–BT94, CA2, CA15, CA28, DD1, DD8, DD9, DG1, DG2, DG10–DG14, DG16, FK18–FK20, GY1–GY9, HS1–HS9, IM1–IM9, IV1–IV5, IV7, IV12–IV13, IV21–IV28, IV30–IV36, IV40–IV56, JE1–JE4, KA1, KA4–KA6, KA14–KA15, KA18–KA21, KA27–KA30, KW1–KW3, KW6–KW17, KY6–KY10, KY13–KY16, LL49, LL58–LL62, LL64–LL78, PA17–PA78, PH11, PH19–PH26, PH30–PH33, PH35–PH38, PH40–PH44, PH49–PH50, PO30–PO41, SA68, SA71, ZE1–ZE3

Important delivery terms

Shortages must be reported within 48 hours and noted on delivery paperwork
All deliveries must be signed for; redelivery charges may apply
Deferred deliveries may incur storage charges
Collected orders are not subject to delivery charges
Returns are subject to a 25% restocking fee (delivery charges excluded)
Made-to-measure items are non-refundable
Reasonable access to the delivery point must be available; additional charges may apply