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Technical specification


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Conservatory - Technical Specifications


In this section we will illustrate how we build conservatories.


Section 1 Base


A good conservatory starts with a good foundation () & this part is in our opinion absolutely vital to get right. If there are problems here, everything above it will need to come down in order to rectify it!


This is the same standard prescribed by building control for home extensions. We also insulate the sub floor with 75mm celotex & insulate the cavity wall with 100mm dritherm or 50mm celotex. This means that the base is as well insulated as an extension built under the current building regs. Many companies still view conservatories as buildings that are seldom used in the winter & don’t use insulation in the cavity walls & sub-floor so it is worth being very careful at the design stage to ensure you end up with a building suitable for your requirements. We always use a minimum foundation depth of 1000mm for a conservatory with a dwarf wall compared to the industry standard of 600mm


A recent conservatory base -



Following the base installation we install the window & door frames.


As a conservatory relies on the window & door frames for lateral support and wind loading, we feel it is important when the frames are in PVCu to specify aluminium structural components on the corners () & adjacent to the doors in order to stiffen the structure. This is because cheaper plastic couplers tend to result in a building that feels insubstantial & can creak in high winds & shakes when a door is slammed


We also further specify full reinforcement within the PVCu frames on a conservatory. This means that the cill, and all outer frames are reinforced which is important as in order to resist a wind load the structure is fixed to the base & house wall by the use of 120mm masonry screws. If the structure is not reinforced then the fixings are only as strong as the PVCu. This is especially relevant in the case of the fixing of the roof eaves beam to the window & door frames as the eaves beam is a structural item & must be well fixed.


We provide 90 degree door restrictor stays as standard where the doors abut brickwork to prevent the door being opened too far & hold the doors open in warm weather. -



Roof System


The roof system we use is primarily the Ultraframe system as it is the most established roof system on the market & features several patented features which are of benefit to the customer.


Ultraframe chambered top cappings eliminate a cold bridge on the rafter tops resulting in improved thermal performance. -


The Ultraframe roof withstands the most severe UK weather as demonstrated in the video below.


Play the video


Ultraframe conservaflash preformed flashing system provides a neat flashing without the problems associated with lead such as oxidisation & staining of conservatory roofs & damage to self cleaning glass. This is usually used in conjuction with cavity trays.



We recommend the use of cavity trays to prevent the ingress of moisture on the house wall through the porosity of the brickwork as shown above:





Foundations specification

Conservatory base

Baypoles & frame reinforcement
Door restrictors

Erecting the structure

Glazing bars


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