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Home > Structure > Masonry > Concrete Blockwork > Hollow concrete blockwork - masonry Firth HotBloc® Firth has currently engaged in an environmental assessment of its products with Greenbuild. Work is in progress and results will be published shortly.Firth HotBloc® is an insulated hollow masonry block. Standard masonry blocks do not meet the requirements for insulation of the New Zealand Building Code (Clause H1). HotBloc® not only provides structural strength, it also provides insulation to satisfy the increased wall R-values required, from 30 September 2008, in Zones 1, 2 and 3 for compliance with Options (a) and (b) under Clause H1, Table 2(b) of the NZBC. Details of how HotBloc® complies with the revised H1 requirements are provided in the Firth brochure, “Energy Efficient Masonry Construction”. Click on the link to the Product Data Sheet opposite.
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HotBloc® is designed primarily for residential construction. Compliance with Clause H1 of NZBC is achieved as follows: Zone 1. Option (a): HotBloc® 25-Series plus RibRaft® floor. Option (b): HotBloc® 25-Series with RibRaft® floor or concrete floor slab. Zone 2. Option (a): HotBloc® 25-Series plus RibRaft® floor. Option (b): HotBloc® 25-Series with RibRaft® floor or concrete floor slab. Zone 3. Option (a): HotBloc® 25-Series with exterior plaster, 10mm GIB® plasterboard and RibRaft® floor. Option (b): HotBloc® 25-Series with RibRaft® floor or concrete floor slab.
Insulation: HotBloc® meets the requirements of the NZBC. Thermal Mass: Concrete masonry stores energy and delays the passage of heat. This thermal mass effect means homes are easier to keep warm in winter or cool in summer than if built with a light timber frame. Strength: a significant advantage over light timber frame construction. Rigidity, durability, will not rot. Fire Protection: concrete masonry is recognised by the Fire Service and the insurance industry for its extra ability to resist fire. Sound Control: concrete masonry is an ideal sound barrier, providing reduced sound transmission.
Firth HotBloc® is made of concrete; an inert material comprising aggregates, sand, cement, additives and water. Aggregates and sand are sourced close to manufacturing locations. Cement is New Zealand made. No toxic preservatives are required for preventing rot. HotBloc® masonry also includes a polystyrene insert that enables it to meet the insulation requirements of the New Zealand Building Code. Firth is committed to sustainability in concrete manufacture and distribution, including the recycling of surplus raw materials, water and leftover concrete.
Insulation requirements of Clause H1 vary between Zones 1,2 and 3 (ref NZS 4218:2004). Firth HotBloc® masonry is available in the same dimensions as 25-Series masonry for use in Zones 1, 2 and 3. Details of how to meet H1 are provided in the Firth brochure, “Energy Efficient Masonry Construction”, click on the link to the Product Data sheet opposite.
Mortar to be at least 12.5 MPa to meet NZS 4210. Installation requirements for Firth HotBloc® vary between Zones 1, 2 and 3, depending on the R-values required under Clause H1 of the NZBC. The fair face look of HotBloc® can be retained if preferred in Zones 1 and 2, for both Options (a) and (b), and in Zone 3 for Option (b) only. Exterior plaster and 10mm GIB® plasterboard is required in Zone 3 for Option (a).
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