1. Kho cov ntsia hlau los yog ntsia hlau rau saum npoo los ntawm lub qhov nyob hauv qab ntawm cov noog spikes.
2. Cov hlua khi los yog yas yog pom zoo rau cov hlua, cov kav dej thiab cov railings nyias.
3. Siv architectural qib sab nraum zoov weatherproof nplaum rau hauv qab ntawm tus noog ntsia hlau puag, nias lawv ruaj khov rau saum npoo thiab qhuav.
