Poured concrete lintel

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Poured concrete lintel

Although they are always hidden beneath plaster and paint, a key feature of any building is the lintels. These are concrete blocks, reinforced with steel rebar, that sit above windows, doors and any gaps in the bricks. The lintels act as weight-supporting bridges, allowing the contractors to place bricks above a large gap. Lintels can be precast or made on-site to the exact dimensions required.

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April 5, Need to save money on your building project? Materials needed to make concrete lintels Tembo SupaSet cement River sand Crushed stone Wheelbarrow Shovel Trowel Timber for wooden formwork Steel rebar Hammer and nails Steps to making concrete lintels Measure the gap you want to bridge with the concrete lintel and make a note of the exact dimensions length, width and height.

Create the wooden formwork using the timber.Log in or Sign up. Screwfix Community Forum. I'm restoring an old brick built outhouse and need to replace the existing rotten timber lintel with something more substantial. The opening is 3. I have some rebar which I would use.

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I've used the search but not found any previous conversations - I'd appreciate any suggetsions. This is not being done through building regs as its not a very important agricultural building. GHJul 23, I would have thought a decent concrete lintol for that span would be quite deep, so a metal one would be better.

But I am sure Charley Farley will come along and offer some abuse to us both. Swiss TonyJul 23, Thanks Swiss Tony, I'll get in before anyone else has a chance.

It's a 5 degree sloped, single pitch roof and I've removed the old asbestos cement sheeting and am recoving it with corrugated metal sheeting. The lintel only has to take the weight of itself really and a very small additional load from the roof it was previously timber which had rotted away, but it was still taking what little load there was.

I don't like the idea of using timber again as I'd like it to be more resisant to weather. GH, usually the problem with lintols is that if you get it wrong it collapses and then you end up in a right mess. In your case things may be different.

Seems like mm.

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Then make one the same size, throw some bars in keeping them about 30mm from the bottom, and see what happens. As for casting it insitu or lifting it, it may be easier to lift it if you have some farm machinery to lift it with, otherwise cast insitu. But the formwork has to be able to take the weight of the concrete you pour. The size of the concrete lintel will depend on the load it has to take, the amount of reinforcement you put in it and the strength of the concrete.

You usually pick a lintel size based on experience and reinforce to suit.

poured concrete lintel

Tell me what load you want it to takewhat width and depth you would you like it to be and I can tell you the reinforcement required or the beam needs increasing in size. DereekooJul 23, Hi Derek, the lintel will have just one course of bricks on it and will take just the end of the corrugated sheeting which is supported every mm along its length, so very little load.

I can send you a photo to your email address if that would help show you the application. There's a 8" x8" brick column at either end of the opening that already has a pad stone on the top. Thanks for the offer of help, Graham.

The trick then would be to ensure it is protected from the weather, and bob's your uncle. HandyAndy - really. HandyandyJul 23, I'm with HA on this.A lintel is a block or plate of concrete used to fill gaps on buildings or during construction work. They are steel-reinforced in order to carry heavy weights and to prevent the concrete plates from breaking during fitting.

They are usually bought pre-manufactured, but can be made to measure on site.

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Create a mold according to your measurements by sawing out one bottom piece from the plywood, adding half an inch on each of the four sides. Saw out four side pieces. The height of the side pieces should be the same as the thickness of your gap. Nail the side pieces tightly to the bottom with a hammer, creating an open top box. Paint or spray the inside of the box with a treatment to prevent the concrete from sticking to it. Cut the rebars to the same size as the length of the box and place them inside.

Put the spacers between the bars to prevent them from moving.

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Position the box with the bars on a level surface. Mix the ballast and the cement in a bucket. Add water and stir the mixture to a muddy consistency. Put on safety glasses. Pour the concrete mixture into the box on top of the rebars. Fill box up to rim. To ensure an even distribution of the concrete, take a hammer and lightly knock around the edges of the mold.

Wait one minute until the concrete is evenly distributed throughout the mold; add more concrete mixture, if needed. Leave to stand for 24 hours; then remove the mold. Place the concrete plate horizontally on a dry surface and leave for one week. After seven days the lintel is dried throughout and ready for use. Based in the U. Her articles on the film and book trades have been published in "Screen International," "Dagens Naringsliv," "Film Magasinet" and other Scandinavian newspapers and magazines.

She now manages her own book shop.However, for anyone starting out in the industry, getting to grips with interpreting the load spans for prestressed concrete lintels and steel lintels is not always straight forward. This post examines the load span tables featured for both concrete and steel lintels and will demonstrate how you should interpret the values within them. This post is not going to help you with the calculations to arrive at what loads you need the lintel to bear — that is for another blog post.

The first point we need to make is that the load span tables in this post are based on our own products. These products are CE marked, and in order to obtain this accreditation, lintels are subject to the most stringent tests under the Construction Products Regulation CPR.

poured concrete lintel

This means they are independently tested. The values in our own tables have been independently verified by a third party. We now have a lintel load span table quick reference guide available, which you can view online, or you can download for free as a PDF. Once you have finished reading this, why not download the guide for future reference. Initially we will make sure we know what values are included in the table.

Standard Lengths — This is pretty self-explanatory, and simply means the length of the lintel. As standard our steel lintels increase in length by mm, the two values represent the length of the lintel that the values in that column relate to. If it is it means the load span details can be applied to any lintel between mm and mm.

Lintel load span tables: A beginner’s guide

This value is the load in kiloNewtons kN and simply means the load that this particular lintel can safely bear. RM — This means Resistance Moment. RM is quite difficult to explain, and quite frankly is best described by a qualified engineer. In very simple layperson terms it is the force as measured by kiloNewtons metre; kNm at which point the lintel breaks.

You can find out more about resistance moment here. Understanding the load ratios is vital to gaining an appreciation of lintel selection.

The SWL values in our load span tables are often subject to load ratios. These ratios represent the ratio of load that the lintel can bear as inner leaf to outer leaf.

The ratios are different for the different applications. This first load span table is for a standard 50mm cavity lintel. The second table is for a 50mm composite extra heavy duty CXHD lintel. Looking at SWL figures you can see that if your floor load is a ratio so the same weight is applied on both the inner leaf and outer leaf, then this SL50 at mm can take a load of 8kN on each leaf.

If you needed your lintel for an eaves application, then you would use the ratio, which means this lintel would take an inner leaf load of In reality; this is probably not the best lintel for the job.

This level is used for extreme loads. Like I said at the start of the post, the calculations for working out what your load will be is for another post, but once you know this and the other factors affecting lintel selection then you will be able to quickly see which sort of lintel you need to use for the job. The load span tables for prestressed concrete lintels are very similar to the steel lintel tables with the exception of two values.

The principle is the same however; the higher the value, the better the load bearing capabilities on the lintel. Clear span is very simply the length of the opening. If you have a clear span of mm, you will need a mm length lintel to accommodate the required mm span on each side of the opening.Stressline prestressed concrete lintels are synonymous with UK structural building products.

They are cost effective and high performing, and CE marked meaning they are subject to the most stringent tests under the Constructions Product Regulation CPR.

We have been making concrete lintels for over 50 years and continue to produce them today, right here in our Leicestershire-based factory. All of our concrete lintels are prestressed meaning they have heightened strength by way of steel wires, which have been set to high tension running through the middle of the lintel. We manufacture three basic types of concrete lintels — the standard prestressed lintelfair faced lintel and high strength lintel. Our technical team can provide full technical support including lintel scheduling, specification advice and support, and lintel installation advice.

poured concrete lintel

To contact our technical team visit the technical support page. And you can download the specification sheet here. Have a question? If you have a question or would like a quote, you can email us quickly and easily. We will get back to you as soon as we can.

Padstones are often used to help spread heavy point loads across block or brick walls. For more information on our range of padstones, download our information sheet now.

The lintel should be bedded on mortar and levelled both along the lintel and across its width.

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Full bricks, blocks or padstones should be used as bedding areas. Do not bear lintels onto cut blocks. Recommended minimum bearings are mm both ends in structural openings up to mm, mm both ends in structural openings over mm.

What about delivery? All of our products are delivered on flat bed articulated or rigid lorries, with the option of either self offload or crane offload. Steel lintels can be packaged in stock packs or consignment loads. Lintel specification; can tell me more? When specifying concrete lintels you are invited to contact our specification team who will be more than happy to assist in the specification.

The NBS reference of F30 Accessories and sundry items for brick, block and stone walling applies for prestressed concrete lintels.

Do you offer any lintel-based CPD?

How to Make a Lintel Opening in an Existing Concrete Block Wall

Yes we do. If you would like to register your interest or find out more email andrew. This means that in order to obtain the CE marking, they have had to be independently tested and verified. Can I collect the pre-stressed concrete lintels? Yes you can, however you must ensure you adhere to our requirements for collect orders. For more information you can download the collect orders PDF from the downloads page.

The lead time for collect orders is 24 hours.Killeshal supplies an extensive range of lintels —. It is also important to note that many of our lintels are certified to the relevant international standards and those that are not, can be certified. Our concrete lintel range covers multiple width x height options as per the table below and with lengths as you require. Killeshal also manufacture a range of Pad-stones suitable for a wide range of lintels.

Please contact us with your requirements for more details. Consult our engineers, we are always happy to answer any questions. General Brochure. BIM Models. KPC offer a range of Tactile Studs and Tactile Strips for use as anti-slip aids and particularly as aids for the visually impaired.

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Pad-stones Killeshal also manufacture a range of Pad-stones suitable for a wide range of lintels. Notice: JavaScript is required for this content. Featured Product — Tactile Studs. Featured Product Line Drainage. News Categories. Health and Safety Award. We use cookies to extend functionality on our website, and for data analytics purposes. Continuing to use this site indicates acceptance?If you want to create an opening for a new door in an exterior wall, it may seem like a straightforward process: Just knock out the appropriate amount of space, place the new door frame in the hole and clean it up so everything looks nice.

In truth, this should never be attempted because you may be damaging a load-bearing wall in the process, which could lead to extensive damage to the building or, if things go dramatically wrong, people getting hurt or even killed. Especially when dealing with brick and concrete block walls, the installation of a lintel is required before opening up the load-bearing wall.

While installing a lintel in a block wall isn't a difficult process if you have a moderate amount of masonry experience, it still requires care, close attention and a number of safety procedures.

Available in a variety of materials including wood, stone and concrete, most modern buildings use flat steel lintels. Installed into a load-bearing wall, a lintel redirects the load of the wall away from the material below it and into the building's foundation, allowing for the construction of new openings in the wall without risking critical damage to the entire building.

In structures built from brick, concrete or cinder block, the lintel is placed into the mortar between layers of the material. Lintels are easily available from most construction material manufacturers and large hardware stores, and though they aren't terribly difficult to install, you should not attempt to install a lintel into your wall without taking the appropriate precautions.

Check with your local governing office to ensure that your construction plan is legal, and consult a structural engineer or credible builder before proceeding. They will be able to tell you where a lintel can and should be placed as well as what material will be required for that lintel.

Lintels must always be at least millimeters longer than the gap they sit over, so the expert will likely give you the exact measurements required of your new lintel. Once you've consulted an engineer or builder and received approval for your construction project, you can begin the lintel installation process.

If you lack masonry experience, it is advisable to call a professional to complete the rest of this process in order to minimize the potential risk. Steel lintels in concrete block walls are placed in the mortar between blocks, so the first step will be opening a space for the lintel itself.

With the intended position of the lintel marked on the wall, carefully use an angle grinder or masonry saw to cut away the mortar. Grind down parts of the concrete blocks if necessary, and then use a hammer and chisel to knock away anything remaining. Use a hammer drill with a millimeter masonry bit to clean up the gap in the wall so the lintel can be smoothly inserted. Once the space for the lintel is open, set it inside the gap and use a sledgehammer to gently knock it into place, making sure it is snug but without damaging any of the surrounding wall.

You may then secure the lintel by preparing and applying ready-mix mortar to the area around the lintel. Smooth the mortar to match the rest of the wall if necessary, and your lintel will be installed. Blake Flournoy is a writer, reporter, and researcher based out of Baltimore, MD. As a handyman's apprentice operating out of the Atlanta suburbs, they made a name for themselves repairing appliances and installing home decor. They have never seen Seinfeld and are deathly scared of wasps.

Hunker may earn compensation through affiliate links in this story. Share this article. Blake Flournoy. Show Comments.


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