Cruck-Framed Houses of the Shropshire Hills: What They Are and Where to See Them

What is a cruck frame?

A cruck is one of a pair of curved timbers, called blades, that lean together to form an inverted V or A-shape. The pair carries the weight of the roof straight down to the ground or to a low wall, so the walls themselves do not need to be structural. In most crucks the two blades are mirror images, because they were cut from the same oak: the trunk was selected for its natural curve and split lengthwise down the middle.

This is a different idea from the more familiar box frame, in which straight posts and beams form a cage and the roof load is carried by the outside walls. A cruck building stands on its arches. That is why cruck barns could later be given stone or brick walls without anyone touching the roof structure, and why many cruck buildings look so different from their frames: the walls were rebuilt, but the arches remain.

Research summarised in Current Archaeology notes that crucks are almost entirely absent from eastern England. Paul Barnwell has proposed that coppiced woodland in the east did not produce suitably shaped timber, an explanation the article presents as valuable but unproven.^[3]

Anatomy of a cruck truss

A cruck truss, or cruck frame, is one pair of blades with the timbers that tie them together. A building is a series of trusses, with the spaces between them called bays. The terms you will see in listing descriptions are below.

• Blade: one of the two curved timbers.
• Apex: the top, where the blades meet. Listing descriptions sometimes give an “Alcock apex type”, a classification by Nat Alcock for the way the blades join at the top.^[1]
• Collar: a horizontal timber joining the blades higher up, often with an upper and lower collar.
• Tie beam: a horizontal timber lower down that stops the blades spreading.
• Purlins and ridge: the longer timbers that run along the building and carry the rafters.
• Windbraces: curved diagonals between purlin and rafter that stiffen the roof. At Upper Farmhouse in Pontesbury the dog-leg windbraces form lozenge patterns.^[4]
• Bay: the space between two trusses.

Full, raised, base and jointed

Specialists divide crucks by where the blades start and how they are made. The descriptions below follow the terms used in listings and in standard references.

• Full (true) cruck: blades run from near the ground to the ridge.
• Raised cruck: blades start part-way up the wall, often on a stone wall or a masonry base, and run to the ridge.
• Base cruck: blades are cut off by a tie beam or similar member, with a separate roof structure above.
• Jointed cruck: each blade is made of two pieces joined near the eaves, so it does not need one huge naturally curved tree.^[5]

The “true” in a listing means a full cruck. When a listing says “six large true cruck trusses” it is describing six full arches reaching the roof.

How a cruck was made

Almost every step of cruck building depended on the tree. Carpenters looked for oaks whose trunk or limb curved the right way and selected them while standing. After felling, the timber was converted by hand: a log was split and squared with axe and adze, then the pair of blades were joined on the ground, the frame assembled, and the finished arch raised upright, in effect a prefabricated truss. The blades of any one truss were usually cut from the same split trunk, so they match.

Crucks needed large oaks of the right curve.

How old are crucks?

Crucks are medieval in origin and mainly 14th to 16th century in what survives. The Vernacular Architecture Group's catalogue has grown from 2,045 known crucks in the first edition (1973) to 4,426, and tree-ring dates now exist for more than 10% of known true crucks.^[3] The oldest dated example is the Royal George in Cottingham, Northamptonshire, from 1262. The latest dated crucks in England and Wales come from 1742. More than 75% of the dated crucks were built in the 15th and 16th centuries, with 12 from the 13th century and 53 from the 14th.^[3] Leigh Court Barn in Worcestershire, felled in 1344, is over 42 metres long.^[3]

Those figures come from the survey published as Cruck Building: a survey (Alcock, Barnwell and Cherry, 2019), summarised by Chris Catling in Current Archaeology. Without tree-ring dating a cruck is hard to date by eye: carpenters carried on using the form where curved timber was available, so a cruck is not automatically medieval.

Cruck buildings you can find in Shropshire

Many Shropshire crucks are barns and farm buildings, because that is where they survived. Most are in private ownership and visible only from a road or footpath, so respect that. These examples are all documented in the National Heritage List for England or other published sources.

• Cruck barn at Binweston, Worthen with Shelve (Grade II*). Built in the 14th or 15th century and extended in the 17th. It has seven cruck trusses, six original bays and later extensions. The outer walls have been rebuilt in concrete blocks, but the listing calls it a remarkable survival of a medieval agricultural building, noting that such buildings are not commonly found in Shropshire.^[1]
• Cruck House, Little Ness (Grade II). A house from the 14th or 15th century, later refaced in red brick, probably three framed bays. An exposed full cruck truss is visible in the right-hand gable end, and the house contains four full cruck trusses.^[2]
• Barn at Upper Farmhouse, Pontesbury (Grade II). Probably 14th or 15th century, once an open hall, then a barn, now a cowshed. Five bays and six large true cruck trusses with cambered collars, partial smoke-blackening and lozenge windbraces.^[4]
• Cruck barn at Mere House, Baschurch (Grade II). A pre-1700 barn, listed in 2010, with two cruck trusses about 7.5 metres tall either side of a threshing bay. The oak frame is encased in red brick, and it may have been moved and re-erected around 1700.^[6]
• Stokesay Castle Great Hall. The roof of the hall, in a house English Heritage says was almost entirely complete by 1291, combines raised crucks with other truss types, a reminder that carpenters often used several methods in one building.^[7][8]

For the Marches towns and landscapes where these buildings sit, see period towns in the Welsh Marches and our Shropshire architectural heritage overview.

How to spot a cruck

You do not need to enter a building. Walk round and look at the gable ends and the roof line, and compare with the checklist in the diagram below.

• A curved timber rising from near ground level on the gable wall is a classic sign of a full cruck. In a brick or stone building it may be visible only inside.
• Steeply pitched roofs with thick, closely spaced trusses seen inside a barn are a good clue.
• Check listing descriptions on the National Heritage List for England: search “cruck” with your town. Listings describe the number of trusses and often the date.
• Be cautious about assuming: some “cruck-like” curved timbers are simply braces, and some crucks are hidden entirely behind walls and ceilings.

Myths about crucks

• “Crucks are always medieval.” Most are, but the latest dated examples are 18th-century, and carpenters kept using the form where curved timber was available.
• “A cruck house is a small, poor house.” Not necessarily. Crucks appear in barns, halls and substantial farmhouses; Stokesay's hall roof is a high-status building.
• “The curved timbers are decorative.” They are structure, and cutting through a blade to change a room is one of the most damaging things an owner can do. Always get specialist advice and any necessary consent first.
• “Crucks are found everywhere.” Not so: they are rare in the east.

Living with a cruck house

If you own an old cruck cottage or barn conversion, the problems are the ones every historic timber building has: damp trapped by modern cement or paint, insect attack, and structural alterations. Lime plaster and breathable finishes protect old timber; cement-rich renders can trap moisture against it. A cruck cottage often has low ceilings and a small footprint, so small details work better than large ones: a modest plaster ceiling rose, a compact wall light, or a plaster switch surround sit comfortably in these rooms. Our guides to English cottage style, restoring a period home in Shropshire and ceiling roses for low ceilings may help. Follow each product's own instructions (see our paintable plaster guide for finishing) and use a qualified electrician for wiring, and check with your conservation officer before drilling or fixing anything to historic timbers.

Keep reading

• Shropshire architectural heritage
• Period towns in the Welsh Marches: Ludlow and Bridgnorth
• English cottage style
• Restoring a period home in Shropshire
• Black-and-white Shropshire: how to read a timber frame

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Frequently asked questions

What is a cruck frame?

A cruck frame is a pair of curved timbers, called blades, that lean together to form an A-shape and carry the weight of the roof. The two blades are usually cut from one oak split lengthwise, so they match.

How old are cruck buildings?

Most surviving crucks date from the 14th to 16th centuries. The oldest tree-ring dated example is from 1262 and the latest dated examples in England and Wales are from the 18th century, so a cruck is not automatically medieval.

How many cruck buildings are there?

The Vernacular Architecture Group catalogue records 4,426 cruck buildings in Britain in the most recent survey, up from 2,045 in the first edition in 1973.

Where can I see cruck buildings in Shropshire?

Documented examples include the cruck barn at Binweston, Cruck House at Little Ness, the barn at Upper Farmhouse in Pontesbury and the cruck barn at Mere House, Baschurch. Most are private, so look from public paths and roads. The Great Hall roof at Stokesay Castle includes raised crucks.

What is the difference between a full cruck and a raised cruck?

In a full cruck the blades start at or near the ground. In a raised cruck they start part-way up the wall, usually on a masonry wall, and still reach the ridge.

Why are crucks rare in eastern England?

One suggestion summarised in Current Archaeology is that coppiced woodland in the east did not produce timber of the right shape; the article presents it as unproven.

Can I remove or alter a cruck truss in my house?

You should not without specialist advice. Crucks are structural, and in a listed building changes generally need consent from the local planning authority.