PERFORMANCE

PERFORMANCE outward opening casement window

Our best-selling cost-effective triple glazed timber outward opening casement window. Uw 0.85 W/m²K.

OUT78

Outward opening (inward opening also available)
High performance triple glazing
FSC^® certified timber in redwood & oak
FSC^® certified Accoya timber drip rail for durability
Dual compression seals for long-term airtightness
Secured by Design option
78mm profile
BRE Green Guide A+
Made exclusively for Green Building Store by our partners in northern Europe

Installation Gallery

PERFORMANCE triple glazed timber windows and doors at Sheffield retrofit project

PERFORMANCE triple glazed timber windows and doors at Sheffield retrofit project

PERFORMANCE triple glazed timber windows at She

PERFORMANCE triple glazed timber windows and doors at Sheffield retrofit pr

PERFORMANCE triple glazed timber windows at Sheffield retrofit project

PERFORMANCE triple glazed timber windows at Sheffield retro

PERFORMANCE triple glazed timber windows at Sheffield retrofit project

glazed windows and doors at Sheffield low energy retrofit timber window at Sheffield retrofit project

glazed windows and doors at Sheffield low energy retrofit timber window at Sheffield retrofit project

PERFORMANCE triple glazed timber windows and doors at Sheffield retrofit project

PERFORMANCE triple glazed timber windows and door at The Orchard - Arts and Crafts low energy newbuild - photograph Adam Scott

PERFORMANCE triple glazed timber window at The Orchard - Arts and Crafts low energy newbuild - photograph Adam Scott

PERFORMANCE triple glazed timber windows and door at The Orchard - Arts and Crafts low energy newbuild - photograph Adam Scott

PERFORMANCE triple glazed timber windows at The Orchard - Arts and Crafts low energy newbuild - photograph Adam Scott

PERFORMANCE triple glazed timber windows at The Orchard - Arts and Crafts low energy newbuild - photograph Adam Scott

PERFORMANCE triple glazed timber window at The Orchard - Arts and Crafts low energy newbuild - photograph Adam Scott

PERFORMANCE triple glazed timber window at The Orchard - Arts and Crafts low energy newbuild - photograph Adam Scott

PERFORMANCE timber windows at Hertfordshire selfbuild

PERFORMANCE glazed timber balcony doors at Hertfordshire selfbuild

PERFORMANCE windows and doors at Hertfordshire newbuild project

PERFORMANCE triple glazed timber windows and doors at Erneley Close EnerPHit project, Manchester. PHOTO: Eastlands Homes

Green Building Store PERFORMANCE windows at Erneley Close EnerPHit

Green Building Store PERFORMANCE windows at Arts and Crafts style housee Sussex

Performance triple glazed timber window at Arts and Crafts House

Performance window at Arts and Crafts House including Eyebrow window

PERFORMANCE triple glazed timber windows with interstitial glazing bars at Sussex low energy retrofit

PERFORMANCE triple glazed timber windows with interstitial glazing bars at Sussex low energy retrofit

PERFORMANCE triple glazed timber windows with interstitial glazing bars at Sussex low energy retrofit

PERFORMANCE triple glazed timber windows with interstitial glazing bars at Sussex low energy retrofit

PERFORMANCE triple glazed timber windows with interstitial glazing bars at Sussex low energy retrofit

PERFORMANCE triple glazed timber windows at Reading low energy retrofit

PERFORMANCE triple glazed timber windows at Reading low energy retrofit

PERFORMANCE triple glazed timber windows at Reading low energy retrofit

PERFORMANCE triple glazed timber windows at Reading low energy retrofit

PERFORMANCE triple glazed timber windows at Reading low energy retrofit

PERFORMANCE triple glazed timber windows and doors at Reading low energy retrofit

PERFORMANCE triple glazed windows and doors at Reading retrofit

Window Gallery

New design PERFORMANCE and ULTRA triple glazed timber windows 2018

New design for PERFORMANCE triple glazed timber window range with new Accoya drip rail

Glazing & U values

Whole window U value: Uw 0.85 W/m²K (Redwood)
Whole window U value: Uw 0.93 W/m²K (Oak)
Glazing Ug: 0.58 W/m2K
Triple unit: Argon fill 44 mm
Light transmission value: 74.1%

Typical maximum sizes

Fixed light: 2500 mm X 2500 mm
Side hung: 950 mm X 1520 mm
Top hung: 1300 mm X 1650 mm

Test results

Air Permeability BS EN 12207: 600 Pa Class 4

Water tightness BS EN 12208: 750 Pa Class E750 (Top hung)

Water tightness BS EN 12208: 900 Pa Class E900 (Side hung)

Wind load BS EN 12210: 2400 Pa Class E2400

Exposure category BS 6375-1: 2400

* U values calculated for standard single window 1230 X 1480

Please see some sample styles below. If you can’t see the style you’re looking for, please get in touch, as everything we do is bespoke and made to your requirements.

Glazing Options

Obscure glazing waterdrop

waterdrop

Obscure glazing silvit

silvit

Obscure glazing niagra

niagra

masterpoint

Obscure glazing mastercarre

mastercarre

kura

kathedral

flutesmatt

Obscure glazing flutes

flutes

Obscure glazing deltamat

deltamat

Obscure glazing delta

delta

Obscure glazing crepi

crepi

Obscure glazing chinchilla

chinchilla

Obscure glazing atlantic

atlantic

altdeutschK

Obscure glazing abstracto

abstracto

simple obscure

Obscure glazing puntaedo

puntaedo

Solar control glazing

Safety glazing toughened or laminated

Safety glazing toughened or laminated

Acoustic glazing

Redwood Colour Options

Pine

Oak

Afzelia

Afromosia

Standard RAL colours

Standard RAL colours: www.ralcolor.com

View RAL colour options here

Oak Timber Stains

Oak Walnut

Oak Teak

Oak Light Oak

Oak Clear

Handles

Black F9714

Chrome F49

Silver Matt F1

Gold Matt F3

Brochure: PERFORMANCE & ULTRA WINDOWS & DOORS

WWA Installation Guidelines for Timber Windows

PERFORMANCE casement OUT78 window sections PDF

PERFORMANCE casement OUT78 window sections DWG

PHPP spreadsheet

Request a Brochure

Your Name (required)

Your Email (required)

Organisation name

Address & Post Code

Where did you hear about us? (required)

Products
Windows & doors
MVHR ventilation
Water saving washrooms
Insulation & airtightness
Consultancy & training

Type
EmailPost

Sign up for our monthly e-newsletter
Professional
News & offers (for selfbuilders)

The data you submit will be solely used by Green Building Store and its approved suppliers to ensure that we deal with your enquiry effectively and provide communications directly relating to your enquiry. If you also tick the e-newsletter section, this will be taken as express permission/ consent to receive e-newsletters from Green Building Store. Green Building Store will never sell your data and your data will be safeguarded in accordance with our Privacy Policy.
Get a window/door quote

Get an MVHR quote

Contact Us

Affiliations & Accreditations