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Practice paper

Insulating solid floors in listed buildings: Problems and opportunities

Sarah Woodger
Journal of Building Survey, Appraisal & Valuation, 13 (3), 217-228 (2025)
https://doi.org/10.69554/BTQB3135

Abstract

This paper seeks to assist in the surveying of listed properties and the considerations that may be taken when addressing whether to insulate solid flooring and, if so, how to go about it. The author seeks to address a variety of potential problems and opportunities that may be found when assessing the property and does not consider this paper to cover all eventualities. One of the main things the author is aware of is the merit of each property needing to be assessed as a unique and individual entity. In many cases, it may also be worth looking at areas within the property itself; different rooms will have different needs, uses and potentially differing existing flooring and will therefore need to be addressed on a room-by-room basis. As the author runs a company that specialises in limecrete flooring, she is aware of her own potential bias and the weighted information that she will provide in her own specialist field. Therefore, this paper does not aim to suggest a single answer approach to the question of insulating solid floors in listed buildings; however, more detail will be given with regard to an insulated limecrete flooring approach. The author does not hold any design liability, and any design ideas described in this paper are based upon her knowledge and experience in the field. In particular, when it comes to limecrete floor design, she is drawing on designs that her company has been given by their customers to work on and the opportunities this has given for consideration in this paper.

Keywords: limecrete; floors; insulation; conservation; retrofit

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Author's Biography

Sarah Woodger is the Director of Operations for Limecrete Products UK Limited (trading as The Limecrete Company). Having begun working as an office manager in 2015, she spent considerable time learning about limecrete flooring and had a particular interest in its specifications for older buildings during her first four years at the company. Subsequently, she has overseen the day-to-day running of The Limecrete Company since it went into new ownership in March 2020. Sarah’s knowledge has been gained through the company’s vast amount of experience in the field, along with extensive reading and talking with surveyors, structural engineers, architects, conservation specialists, suppliers and craftspeople. The Limecrete Company is in the process of beginning its own research programme, which has a particular focus on the moisture permeability of NHL5-based limecrete within differing mix designs as well as mix design, methodology, flexural and compressive strength testing, as they are aware that there is much more to be learned and, more importantly, proven within their field. The company has been installing insulated limecrete floors since 2006 and has a huge back catalogue of works, many listed buildings and historic monuments, as well as new builds and more modest buildings.

Citation

Woodger, Sarah (2025, January 1). Insulating solid floors in listed buildings: Problems and opportunities. In the Journal of Building Survey, Appraisal & Valuation, Volume 13, Issue 3. https://doi.org/10.69554/BTQB3135.

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cover image, Journal of Building Survey, Appraisal & Valuation
Journal of Building Survey, Appraisal & Valuation
Volume 13 / Issue 3
© Henry Stewart
Publications LLP

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