• Design,  Hempcrete,  Research & Resources

    Hempcrete & Woodfibre – Looking at performance (including U-values)

    “For example 240mm thickness of hempcrete meets current UK building regulations for insulation (compared to around 80 mm of polyurethane insulation board). However because hempcrete is cheaper than synthetic insulation materials, and is used to form a monolithic wall, the usual thickness of hempcrete applied in a new building is 300-400mm for a wall. The typical thermal conductivity of hempcrete is typically 0.06 to 0.07 W/mK. U-values for hempcrete vary depending on the thickness, the type of binder used, the exact specification, application techniques and the skill of the contractor, however a typical u-value (for a 350mm thick hempcrete wall) is 0.17 W/m2K.” https://www.ukhempcrete.com/hempcrete-buildings-thermal-performance-and-costs/ Useful comparison of natural insulation materials.…

  • Cost,  Hempcrete

    Hempcrete Downstairs Front Room Install Audit Nov 2016

    Fri 11th (Day 1) Intended : Empty room, remove plaster, coving & picture rail, brush/clean brick walls Achieved : Emptied room, purchased amazon items Sat 12th Intended : nothing Achieved : Removed plaster, cornice & picture rail. Visited Simon & collected Fein multimaster & bahco nail puller. Sun 13th (Day 2) Intended : Trim back floor & ceiling, lift floorboards, clear detritus from underfloor, fix joists in bay window Achieved : Wire brushed & vacuumed brick walls. Trimmed floorboards 100mm back. Major joist repair needed – decided to complete at later stage. Mon 14th Intended : nothing Achieved : Simon visit (2-3hrs). Lifted half of floorboards, removed nails & cleared…

  • Hempcrete

    Downstairs Front Room : Progress as of 13/11/2016

    Friday 11th November : Cleared room Photographed items to sell on ebay Purchased from Amazon (total £107.39) : Dust mask filters £7.99 x 2 Nail Punch(es) £7.17 Duct tape £2.48 Floorboard lifter tool £19.12 Tarp £7.82 Cotton Gloves £1.89 18” Fan £39.99 Water sprayer 1.25l £12.94 Saturday 12th : Collected Fein Multimaster & Bahco 38 nail puller Removed cornice & picture rail carefully. Some cornice cracked on removal. Sunday 13th : Purchased from Screwfix (total £31.76) : Gauntlets £2.79 x 2 Rubble sacks  £5 Spax 5 x 50mm £12 Oval nails 50mm £4.69 Cold chisel £4.49 Rest of plaster removed Walls brushed down with wire brush and vacuumed Floor cut…

  • Hempcrete

    Project Plan : Downstairs Front Room

    This is my first attempt at a project plan. We will compare the actual progress to the schedule as we go to see how the reality compares to our estimates to better inform our future plans. Project plan : Downstairs Front Room Proposal : Hemp Lime bio-aggregate cast onto original brickwork. Principle : Energy retrofitting the traditional thermal envelope Design : Removal of existing layer and clean surface for effective bond Dimensions : Front Wall : Left    660mm + 270mm =     930mm Right 630mm + 290mm =     920mm Area = (0.93 + 0.92) x 2.9 = 5.365m2 Window : Below 650mm + 1070mm + 610mm = 2330mm Area…