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Keystone BOX/K-100 Solid Wall Box Lintel 3900mm INS

SKU

KBX139INS

£244.74 £203.95

Product Information

Keystone BOX/K-100 Solid Wall Box Lintel, 3900mm (12ft 9in) length
Designed for solid walls 100-215mm wide, standard duty load capacity
Built-in insulation enhances thermal efficiency for energy-conscious builds
Supports full wet masonry load immediately after installation
Lintel requires minimum 150mm bearing each side, bedding on mortar; propping recommended for faster construction

Details

The Keystone BOX/K-100 Solid Wall Box Lintel 3900mm INS is engineered for builders and contractors needing dependable support for internal openings in solid masonry walls. Featuring integrated insulation, this lintel not only carries standard loads but also improves thermal performance, making it an excellent choice for energy-efficient projects. Please note, lintels must be installed with the specified bearing and bedding requirements for optimal performance.

Application

Specifically designed for solid walls between 100mm and 215mm thick, this box lintel is ideal for supporting brickwork or blockwork above internal openings such as doorways and windows. Its insulated core helps reduce thermal bridging, making it suitable for projects where building regulations demand improved energy efficiency. The lintel carries the full wet masonry load from the moment it is laid, allowing for quicker progression on site. Propping is advised to speed up construction and ensure structural stability during curing.

Dimension

Length: 3900mm (12ft 9in)
Height: 215mm
Width: 95mm
Suitable for wall widths from 100mm up to 215mm

Material

Steel with integrated thermal insulation
Coating to resist corrosion and enhance durability on site

Type

Box lintel for solid masonry walls
Standard duty structural support

All lintels require a minimum bearing of 150mm on each side of the opening, bedding on mortar. Propping during installation is recommended to maintain speed and safety. For specific technical advice or sizing beyond standard options, please contact our sales team.

More Information

More Information
Type	Box Lintels
Loading	Standard Duty
Length	3900mm
Weight	50.970000
Manufacturer	Keystone
Sap Id	KBX139INS

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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