Journal

Notes

What we have learned building envelopes and long-span roofs, written for architects specifying a system and contractors pricing one. No press releases.

Triangulated free-form glass skylight over the multi-storey atrium of Ava Center Shopping Mall, Tehran

Daylighting

Skylight Types Explained: Where Each One Works and How to Choose

Every type of skylight, what each one is for, and how they fail — dome, pyramid, ridge, barrel vault, walk-on, atrium and free-form roof glazing.

25 September 2026 33 min read

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Space frame roof over the Arian Motor production hall in Arak, the floor below it clear of columns

Long-span structures

Space Frame vs Portal Frame: Where the Time and Money Actually Go

A worked comparison of a 60 m clear-span production hall built as a trussed portal frame and as a space frame — tonnage, foundations, programme, and the span below which we would tell you not to buy one from us.

4 September 2026 9 min read

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Looking for the technical detail?

The fifteen systems each carry a full specification panel referenced to EN and ASCE standards, and both 2026 catalogues are free to download.

The fifteen systems Download the catalogues