Patrick Ryan Associates

A Big Welcome...

Posted on Monday, April 29, 2019 by Rebecca Dawson

Our team here at PRA has expanded again and we are pleased to welcome Tamer Duman and Andrea Bonizzato to our team.

  • Tamer Duman has joined us as a Facade consultant from Florida, USA where he previously worked for building envelope consultant RJH Associates, Inc.  Originally from Turkey, Tamer moved to the USA to continue his studies and he obtained ASCE (American Society of Civil Engineers) and IIBEC (International Institution of Building Enclousure Consultants) membership.

His extensive experience within the structural engineering, planning and design and facade surveys will make him an asset to our team.

Tamer has moved from the sunshine state to Epsom where he is looking forward to settling here with his new wife.

Andrea Bonizzato joins us as our new Graduate Facade Engineer. Previously he worked in the sustainability department for the Dutch company Deerns in Milan where he worked on several major projects, including the Transport Education Centre (TEC) Museum, Doha. 

Andrea holds an MSc in Building Engineering Systems and gained Chartered status in Italy.

In his spare time Andrea is a keen sportsman and is a verdant fan of AC Milan.



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Luke Prior joins our team

Posted on Friday, February 08, 2019 by Rebecca Dawson


We are pleased to announce that Luke Prior has joined us as a Senior Facade Consultant heading our façade survey and investigation team. Luke will also be using his considerable design skills within our projects design team.
He joins us from the renowned cladding company James and Taylor. His past projects include the Tate Modern extension design, Addenbrookes Hospital, The Brighton Eye 360 and the Barrakka Lift, Malta.


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We welcome a new member to our team

Posted on Monday, October 22, 2018 by Rebecca Dawson

A few words from our new Graduate Facade Engineer...

My full name is Elizaveta, but everyone calls me Lisa or Liza. I am 23 years old and I come from Estonia and I speak Estonian, Russian and English, also trying to learn German but it is still very basic.

I moved to the UK 4 years ago for uni. I've done an Architectural Engineering degree in Cardiff University, Wales. After graduation I've completed one year of work experience which I really liked and it allowed me to see the industry of Facade engineering from inside. It also gave me the understanding in what direction I want to develop professionally and this is what brought me to Patrick Ryan Associates, and I am very happy about it!

In my spare time I like going to various music concerts, art galleries, theatres or do anything outdoors. I consider myself to be a quite active and curious person so I'm always up for any sort of activities.

In the past I've done many years of violin class, various dancing and art classes. Also, when I was 16-19 did work with kids (summer camp leader and volunteering in children's house) and travelled in Europe for youth exchange projects.

Since I've moved to the UK I've met amazing friends that are now my family away from home and I very appreciate it.


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Posted on Thursday, September 13, 2018 by Rebecca Dawson

PRA are now in EPSOM

Our team has recently expanded, which meant we were literally bursting out of our office. It had become clear that we needed to move. Last Friday we packed up, and moved the 4 miles from Ewell to our new premises based in central Epsom.

Conveniently positioned next to the station and more excitedly the high street , the light filled, first floor office provides us with a great space will plenty of room to expand into!

Our new address is now

Suite 2 Oaks House
12-22 West Street
KT18 7RG
020 8254 9920

Please change your records accordingly.



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SFE: Fire Engineering the Facade

Posted on Wednesday, August 29, 2018 by Rebecca Dawson

Fire Engineering the Façade 

Speaker: Garry White, BB7

Tuesday 25th September
Refreshments from 17:30, event will finish by 19:30

Book here

Aluk Design Studio, Henry Thomas House, 5-11 Worship Street, London, EC2A 2BH



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20 Year Anniversary of PRA 1998-2018

Posted on Thursday, July 19, 2018 by Rebecca Dawson

Patrick Ryan Associates 
20th Anniversary Summer Party 2018 

On 14th July, PRA celebrated it's 20 Year Anniversary at our Summer Party BBQ 2018 with our team and their families, our consultants and our clients, past and present.  Patrick and Mary hosted a wonderful BBQ and the afternoon was filled with great food, wine and conversations.

The 'DISCO' bouncy castle proved to be a great success and was enjoyed not only by the kids but by the energetic members of our team as well!

The company was started by Patrick and was run out of his home, with the help from external consultants in 1998. 

At 2018 we have a team of 11 members of staff, over several departments, and is continuing to grow into a multi-disciplined team.


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PRA Fun in the Sun

Posted on Monday, July 09, 2018 by Rebecca Dawson

Julian Birbeck along with Anri, Odete and Angelo, were lucky enough to soak up the sun and atmosphere at the Thomann-Hanry Summer Party 2018. This is a highlight in the PRA calendar and is always an enjoyable opportunity to meet people from a variety of sectors.

Thomann-Hanry put on a wonderful evening of food & drink with a great roof terrace view of London from the Ham Yard Hotel.

 Thank you for our invites, and we hope to be able to join you for the festivities next Summer!


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Thermal Bridging in Rainscreen Cladding

Posted on Friday, June 01, 2018 by Roger Peatling

A simple rainscreen cladding support system typically consists of ‘helping hand’ brackets. These are the backbone of any rainscreen cladding system and are fixed to the substrate at set vertical and horizontal separations. A layer of insulation is then fixed to the substrate, and where the brackets are placed they penetrate directly through the insulation, forming what it is called a “Point Thermal Bridge”. Aluminium ‘L’ and ‘T’ profiles are inserted into the brackets, lined, levelled and fixed. A ventilated layer behind the external façade material ensures the risk of condensation is minimised as well as dissipating solar gain in the building.

One of our recent projects included five mixed-use medium rise buildings. Commercial units occupy the lower levels, together with amenity space including outdoor landscaped podium areas and some residential units. The upper levels are residential use. The development consists of 467 residential units (planning use class C3); including a proportion of discount market rent units and circa 2000m2 of flexible commercial/community space (use classes A1/A3) in new buildings ranging from 2 to 17 storey’s in height.

Rainscreen Cladding



Please click here to view the full article in PDF format

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Thermal Analysis on Facades

Posted on Thursday, November 02, 2017 by Patrick Ryan


Thermal Analysis on Facades
(Download the original pdf file here)

To achieve good sustainability in our buildings we need to consider heating, ventilation, solar gain, building use, choice of materials and building form, amongst others. Very good thermal separation between inside and outside is necessary to obtain the required internal conditions and optimum energy efficiency. To achieve this we must avoid thermal bridging through the wall construction.

A thermal bridge is a part of the structure of lower thermal resistance that bridges adjacent parts of higher thermal resistance and which can result in localised cold surfaces on which condensation, mould growth and/or pattern staining can occur. Not assessing the risks could lead to inappropriate construction techniques, and an inadequate protection will result in financial and energy losses over the life of the building. It could also compromise the health and safety of its occupants.

Patrick Ryan Associates have expertise in the field of thermal analysis and have been working closely with clients, architects and contractors to achieve very low thermal transmission for the building facades on our projects. In doing so we can also ensure that there is no surface condensation and minimise thermal bridging at the junctions. See example of a moderately efficient window system above with no risk of condensation.

We were recently involved in the change of use to a residential of an office building, originally built in the mid 1980’s, with refurbishment of the facades. Many of the existing fixed double glazed units were replaced with new opening windows for natural ventilation and insulated double glazed spandrel panels. Our thermal report, with calculations in accordance to British and European Standards, determined the thermal transmission through the different types of curtain wall and windows and verified that the facade U-values complied with Approved Document Part L. Some of the output from this analysis is shown below.

To calculate the thermal transmittance of a Window/Curtain Wall (Uw and Ucw), the following information is required:

• Thermal characteristics, Uglass [W/(m2K)], of the centre pane of the glass unit, and it’s Area [m2];
• Thermal characteristics, Uframe [W/(m2K)] of every frame element in the Window/Curtain Wall, and it’s Area [m2].
• Linear thermal transmittance (edge psi-values [W/(mK)]) of the junction between the different frame elements and the glass/spandrel panel. In addition, the perimeter length [m] of the junction must be known.

In the case of the mullion framing shown below, modelling has been carried out using specialist two-dimensional thermal analysis software, which calculates with the finite element method. The advantage of our software is that it is continuously updated to the most recent European standards. In this case, we have also carried out interstitial condensation analysis. The graphics below show the original AutoCAD model for the curtain wall system and its modelling for thermal analysis in our specialist software. This resulted in the correct calculation of the frame U-value, for curtain walling, in accordance with BS EN ISO 12631-2:2012, as shown on the diagram.
 Once the thermal characteristics of the elements of the curtain wall have been calculated, it is possible to calculate the thermal transmittance of the curtain wall. A typical example is shown in the following table:



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