Pre-cut timber I-joist frame can be around just 15% of the outer frame
Vapour open natural insulations make up around 85% of the external frame
Robust, simple and well detailed air-tightness layer
Webbed floor joists for greater strength and easier services installation
Thermal bridge free foundation designs
MVHR fully designed in 3D, installed by you, commissioned by us
Triple glazed windows from Josko, Katzbeck or Rationel
PH15 works with a wide range of external finishes
Better fabric performance means fewer renewables needed for NetZero in use
MORE THAN JUST A TIMBER FRAME
PH15 is more than a timber frame. PH15 also includes the triple-glazed windows, doors, airtightness products and a high quality ventilation system. Each project has a bespoke PH15 Plan with all the elements delivered to site to suit your build programme.
PH15 covers all the elements needed to maximise the benefits to you. This eliminates the cost of multiple specialist consultants. Technical details covered include the energy modelling, airtight testing, overheating risk assessment and standard thermal modelling.
Choose from a wide range of windows and rooflights from Josko, Katzbeck, Rationel, 21 degrees, Lacuna, Bewiso, and Fakro. Styles range from contemporary to traditional sash style windows.
For architects and designers there is a PH15 System Design Guide or we can design your home inhouse if you prefer. There is a full library of PH15 System Construction Details (scale 1:10) to suit your aesthetic preferences.
The PH15 system is approved by BOPAS the Build Offsite Property Assurance Scheme which is recognised by the UK’s principle mortgage suppliers.
Pre-cut timber I-joist frame can be around just 15% of the outer frame
Vapour open natural insulations make up around 85% of the external frame
Robust, simple and well detailed air-tightness layer
Webbed floor joists for greater strength and easier services installation
Thermal bridge free foundation designs
MVHR fully designed in 3D, installed by you, commissioned by us
Triple glazed windows from Josko, Katzbeck or Rationel
PH15 works with a wide range of external finishes
Better fabric performance means fewer renewables needed for NetZero in use
MORE THAN JUST A TIMBER FRAME
PH15 is more than a timber frame. PH15 also includes the triple-glazed windows, doors, airtightness products and a high quality ventilation system. Each project has a bespoke PH15 Plan with all the elements delivered to site to suit your build programme.
PH15 covers all the elements needed to maximise the benefits to you. This eliminates the cost of multiple specialist consultants. Technical details covered include the energy modelling, airtight testing, overheating risk assessment and standard thermal modelling.
Choose from a wide range of windows and rooflights from Josko, Katzbeck, Rationel, 21 degrees, Lacuna, Bewiso, and Fakro. Styles range from contemporary to traditional sash style windows.
For architects and designers there is a PH15 System Design Guide or we can design your home inhouse if you prefer. There is a full library of PH15 System Construction Details (scale 1:10) to suit your aesthetic preferences.
The PH15 system is approved by BOPAS the Build Offsite Property Assurance Scheme which is recognised by the UK’s principle mortgage suppliers.
It all starts with expert design
Before work begins on site we design and engineer the frame in 3D BIM software, model the building performance in PHPP and design the ventilation.
Foundations
The PH15 Systems usually starts with conventional strip foundations familiar to all groundworkers albeit to tight tolerances. The design spec describes all of the necessary components and insulation thickness is calculated in the PHPP. The PH15 supply includes the Foamglas loadbearing ‘pillars’ which support the slab. The remainder are standard products obtained by the builder/groundworker.
Precision cut timber frame
Wooden I-Joists offer more economical use of materials, greater strength and reduced thermal bridging than conventional joists. With I-joists thermal bridges are reduced to a minimum due to the inherent efficiency of the I-section profile. And by thermally modelling junctions cold bridges can be further reduced. In many instances this gives a ‘free’ boost to performance equivalent to adding more insulation.
Intermediate floors
Intermediate floors joists are supplied as Ecojoists, parallel stress timber flanges joined with engineered V-shaped steel webs. The result is an easy to install system, and with its open web design, enables fast installation of ventilation, plumbing and electrical systems. All the required hangers, trimmers and strongbacks are also supplied as required.
In addition the floor deck is also supplied as a 22mm t&g Egger Peel Clean Xtra Chipboard.
External woodfibre cladding
On the outside of the building we use woodfibre insulation, adjusting the thickness as approriate which helps keep the building warm in winter and cool in summer. This highly vapour permeable insulation, used in conjunction with a vapour closed internal lining board, ensures that moisture will not build up with-in the structure.
Training modules and support
The PH15 System typically comes with three Training Modules. Firstly, for the groundworks package to ensure a thermally efficient detail and an accurate start for the frame construction is achieved. Secondly, for the erection of the precision cut frame covering window install and airtight sequencing. The third module covers installation of the MVHR.
In addition technical advice and assistance is available throughout the build.
For architects and designers wishing to build using the PH15 system we provide a full Architects Support Package.
Airtightness tapes and membranes
The PH15 System uses a combination of airtight racking board (Unilin Durelis) and Pro Clima tapes and membranes. This simplifies the process of achieving the air changes per hour of 0.6ach or less that is required to meet the Passivhaus standard.
All the necessary airtightness tapes and membranes are supplied along with external tapes for the window/woodfibre junction ensuring that these junctions will be wind and weathertight prior to applying the external finishes.
Cavity insulation
High levels of insulation, installed without gaps is an essential part of a Passivhaus. We use a combination of cellulose blown into the frame void and hemp batts, which for most situations in the UK is 360mm deep. To reduce the embodied carbon further we can supply hemp only for the frame which sequesters 0.70 kgCO2eq for every kg of insulation
Passivhaus suitable windows and doors
The PH15 system is supplied with a wide range of window and door options from Josko, Rationel, Lacuna and Bewiso. We also offer rooflights from Fakro. This ensures a range of wood and wood/alu-clad options to suit all tastes and budgets. The exact specification will depend on the overall performance requirements of each project and, of course, personal design preferences.
Heat Recovery Ventilation System
The MVHR units and ducting layouts designed and supplied as part of the PH15 System are based on self-balancing, Passivhaus Certified units from Zehnder, allied to semi-rigid, radial ducting. These combine cost effectiveness and ease of installation. The units are self balancing which simplifies set up and ensures ongoing optimum efficiency.
The benefits of a well designed, whole house ventilation system are very good indoor air quality, improved thermal comfort and continuous removal of smells and unwanted moisture from the environment.
If you are interested in the PH15 System and would like to build to the highest possible standard why not send us your plans for a FREE QUOTATION.
