Osisi H20 bụ akụkụ dị oke mkpa nke usoro nhazi ihe owuwu ma etinyere ya n'ọrụ nke ọma na nhazi ihe owuwu.Osisi H20, nke a na-akpọkwa H20 beam, I Joist, I beam, Wood H beam ma ọ bụ Wood Girder, bụ nke a na-ejikarị eme ihe n'usoro ihe owuwu simenti, akụkụ sistemu owuwu, sistemu Falsework, owuwu osisi na ihe owuwu ndị ọzọ na-ebu ibu.

Osisi H20bụ ogwe osisi spruce kachasị ike ma dị mfe nke e ji osisi spruce emepụta. A na-emepụta ogwe osisi Formwork H20 anyị n'ogologo ọkọlọtọ dị iche iche. Osisi spruce a ma ama nke na-eto n'ebe dị oke oyi na-eme ka osisi sie ike. Uru nkeOsisi H20: 1. Ike ibu ibu dị elu. 2. Nchedo njedebe nke mkpuchi plastik na-ebelata mmebi ma na-eme ka ndụ ọrụ ka mma. 3. Enwere ike ịhazi ogologo ọ bụla na-erughị mita 6 ma ọ bụ hà nhata. 4. Agba odo na-anaghị amị amị.

Osisi H20bụ ihe na-egbochi nje bacteria, ọ na-adịghịkwa egbochi mmiri nke nwere ihe e ji osisi fir siri ike mee, yana plywood maka weebụ. N'ime usoro simenti e ji rụọ ọrụ a, ọ nwere ike ịbụ sistemụ slab fomwork dakọtara na plywood na nkwado kwụ ọtọ. Ọ nwere ike ịbụ sistemụ mgbidi dakọtara na plywood, ihe nkwado push-pull, mkpanaka tai na ihe ndị ọzọ.Ogwe H20nwere ikike ibu ibu dị elu, a na-ejikarị ya eme ihe n'ụdị ihe e ji akpụ akpụ, ihe e ji akpụ akpụ, ihe e ji akpụ kọlụm na usoro ihe e ji akpụ akpụ ndị ọzọ.