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Complete Hempcrete Renovation to St Nicolasskerk Church Kloosterburen.

Project Details

Location: Kloosterburren, Holland.
Project Type: One of the oldest churches in Holland, parts remaining from circa. 1658.
Project Duration: Community Volunteer Effort - No Timescale.
Project Summary: The Dutch Reformed Church at St. Jansstraat, Kloosterburren is from 1843, located on an elevated former cemetery, now decorated as a park. The saddle roof tower from 1658, owned by the Oude Groninger Kerken Foundation since 1975, stands on leftovers of the former Premonstratensian monastery 'Oldenklooster'. That monastery was founded in 1175.

This internal deep retrofit was a self-build undertaken entirely by the local community as the Church was converted into a cultural centre and given a new lease of life. The church had virtually no insulation, and was suffering from the effects of the cold. The goal was to create a comfortable internal environment for the community without compromising the integrity of the original structure.

Methods of construction specific to this project.

The brick walls were cleaned of all old  plaster and dust, a 10 mm coat of clay plaster was applied to ensure the buildings airtighness. The 200 mm Hempbuild Isohemp hempcrete blocks were fastened tightly to the clay plaster leaving no cavities. A high performance wall heating and cooling system was fixed to the hempcrete blocks. The substrate  was then plastered with a traditional lime and sand mix in keeping with the historical nature on this beautiful church's interior.

The retrofit will significantly reduce energy costs, buffer internal acoustics, and ensure no dampness or mold growth. The thermal capacity added to the churches interior fabric will make this building comfortable for all gatherings no matter the season.

Materials used:

  • Hempbuild 200 mm Isohemp Hempcrete Blocks

  • Galvanised Wall Ties

  • Clay Plaster

  • Hydraulic Lime

  • 5mm and 3 mm washed sands

  • Isohemp Mortar Adhesive

  • Tools & Accessories

Additional construction methods available on this type of project.

This project gave us another insight in to the versatility offered to your project by using Hempbuild Isohemp hempcrete blocks. Other options that were considered was to use the larger 300 mm Hempbuild Isohemp hempcrete block which would give a further increase in thermal phase shift lowering energy costs even more. Our PCS Plaster also could have been used on this project, our plaster can be sprayed on to the walls making light work of large internal walls

Other options open to anyone planning a project such a this would include:

  • A range of plasters and finishes could be used. Traditional sand and lime mixes may be used. Clay based plasters and paints maybe used. Internal or external wood cladding may be used.

Hempbuild Isohemp Hempcrete Block Advantages

  • Can be used as internal and external insulation.

  • A high thermal inertia offers a comfortable environment in all seasons.

  • Quick and easy implementation.

  • Excellent durability over very long time periods.

  • Hempbuild’s Isohemp hempcrete blocks have an excellent fire resistance (class B for the rendered block), hempcrete is inflammable and does not release any toxins or gases.

  • Easy to fix items directly to the wall, gutters, lights, etc.

  • Natural humidity regulation: Thanks to its high permeability to water vapour, the hemp block acts as a moisture buffer. Deals well with moisture and dampness in old walls.

  • Mold resistant: Hemp has a strong natural resistance to mold and bacteria.

  • Environmentally friendly: Our hempblocks are carbon negative and contain no VOC's or harmful toxins for inhabitants.