|At the Buildwas Abbey in Shropshire, the capital of a column in the north nave shows scalloped decoration. Directly above the column a putlog hole - used for supporting scaffolding during the building - remains.|
Putlog holes (also referred to as putlock holes or putholes) are small gaps or recesses incorporated into the construction of a stone or brick wall. Their purpose is to support the short horizontal beams or round poles known as putlogs (or putlocks).
This configuration uses the wall of the structure - along with the putlogs in the putlog holes - to create a type of building platform known as a putlog scaffold. Putlog holes sometimes pass through the entire wall to support the construction of scaffolding on both sides of the wall.
It is believed that this form of scaffolding - originally referred to as socket scaffolding - goes back to early Roman Christian times - perhaps as far back as the fourth century AD. Evidence can be seen in paintings such as the one found on the Hypogeum of Trebius Justus on the via Latina. Within the tympanum of the vault of the tomb is an illustration of workers constructing a brick building using the putlog scaffolding configuration.
Introduced in the 17th century, the terms putlog and putlock have origins in an old masonry phrase used to describe the hole in the wall where workers “put the log” to build the scaffolding during construction. This technique was frequently used to build castles, aqueducts. fortresses and other large structures throughout Europe. The putlog holes - which did not compromise the strength of the walls - remain in many of these buildings.
In modern construction, putlog scaffolding is sometimes referred to as bricklayer’s scaffolding or single scaffolding (since it is made up of only a single row of standards joined together by ledgers fixed with right-angle couplers). This configuration supports the transverse transoms (or putlogs) which are built into the brickwork bed joints as work proceeds. This type of scaffold can only be used for new works in brick or block.
 Related articles on Designing Buildings Wiki
The 2021 edition of the Building Conservation Directory, also available online, has been published. Find skilled trades specialising in work to historic and traditional buildings.
BT has revealed that almost 4,000 of its iconic red phone boxes across the UK are available for local communities to adopt for just £1.
On 26 March the IHBC, led by Prof. John Edwards, hosted a free one-hour CPD webinar ‘Introduction to Building Survey for Retrofit’ for sector professionals.
Greg Clark, writing an opinion piece for RICS, explores how good governance in cities pays dividends.
The Architectural Heritage Fund has issued a report on the first year of its ‘Transforming Places Through Heritage’ grants programme, funded by DCMS.
Europe’s star cities are scattered all over Europe but their perfect geometrical beauty can only be fully admired when seen from above.
The freely available Insight 1 series targets a wide range of cohorts who wish to gain an appreciation of practical heritage conservation.
The restoration and renewal of the Palace of Westminster is of ‘paramount importance’ according to the recent strategic review.
The IHBC's monthly CPD Circular showcases upcoming Events, Awards, Placements, Bursaries & Scholarships, Calls for Papers and more from across the UK and beyond.
The move of a 139 year old Victorian House through the streets of San Francisco drew an excited crowd of onlookers who came out to watch a truck slowly and carefully pull the historic house through the streets.