Episode 15. Heritage Renovations: Five Upgrades for High Performance & Thermal Comfort

Walk into almost any unrenovated Melbourne heritage home on a winter's day and the problem announces itself before you've taken your coat off. Beautiful from the street. Fifteen degrees inside when it's 22 outside.In this episode, builder Simon Clark answers one of the most common questions he hears from Melbourne homeowners: can you really have the soul of a heritage home and the thermal comfort of a modern one? After nearly 50 heritage renovations, his answer is an emphatic yes.Simon opens with the building science behind why heritage homes fail. Double brick walls may be less leaky than weatherboard, but without insulation they push the dew point onto internal surfaces, breeding mould. Single-glazed windows offer virtually no thermal barrier. Dark interiors were never designed with passive solar in mind. The charm is real. So is the discomfort, and the health risk.He then walks through five building fabric upgrades SHM applies to heritage renovations: addressing compromised footings using resin injection and board piers, replacing lightweight subfloors with an insulated infill slab and low carbon concrete to create genuine thermal mass, installing Coolfirm K17 insulation-backed plasterboard internally on double brick walls using the dop and dab method, rebuilding roofs with OSB, vapour-permeable membranes, and ventilated counter battens to allow moisture to disperse rather than condensate, and restoring or upgrading heritage windows, including vacuum insulated glass units for lead light windows council will not permit to be replaced.Each upgrade is designed to work within heritage overlay constraints, keeping council happy while transforming the building from the inside out.You'll learn:Why double brick heritage homes often develop mould problems, and the building science behind itThe infill slab method SHM uses to eliminate subfloor moisture and create thermal mass with low carbon concreteHow Coolfirm K17 insulation-backed plasterboard transforms double brick wall performance without touching the exteriorWhy vapour-permeable membranes and ventilated roof battens outperform traditional roof blanketsHow to upgrade lead light and heritage-listed windows without breaching council requirementsHow to genuinely improve thermal comfort and longevity while working within heritage overlay constraintsWho it's for: Owners of Melbourne heritage homes planning a renovation or extension, architects and designers working within heritage overlays, and anyone who has wondered whether you really have to choose between character and comfort.If you'd like to know more, please reach out to Sustainable Homes Melbourne or call us on 1800 683 697.