Keeping a Tudor Castle fit for a King

Keeping a Tudor Castle fit for a King

The Problem: Reroofing a Grade I Listed Tudor building where preservation of the historic structures was paramount, yet providing some insulation at the same time as providing the benefits of a breathable membrane. 

A project dating from 1511

Thornbury Castle is a Tudor country house which dates from 1511. It was acquired by Henry VIII when he had the owner executed! He stayed there with Anne Boleyn in 1535, and now, as a Grade I Listed building, it is open as a luxury hotel – still a place to stay and impress your spouse!

Irregular rafters and no between-rafter insulation

The re roofing of a wing housing new guest suites meant that the insulation could be upgraded, but with lath and plaster ceilings, and rafters that were very irregular, the advice of the conservation officer was that no between-rafter insulation be used, and that preservation of the original structure was paramount.

Detailing around the chimneys

The chimneys were particularly difficult – as one of only two examples of early Tudor chimneys (the others being at Hampton Court) getting the detailing right was critical. But using an insulating breather membrane, this meant that it could simply be draped over the rafters, avoiding any increase in the depth of the roof build-up and consequent problems at verges, verge abutments and eaves, yet still achieving a U value of 0.69 W/m2K.

insulating breather membrane draped, U=0.69The Solution: TLX Gold, the fully breathable insulating breather membrane with a BBA Certificate, provides a thermal upgrade in limited rafter depth without condensation risk.

  • No increase in roof height required
  • Can be fitted into rafters > 50mm deep with no additional effort
  • Provides a U-value of 0.33 W/m2K when used with 50mm PIR


Click to view our LABC registered TLX Gold (draping) solutions

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