Lub qhov rais sill yog ib feem ntawm lub qhov rais. Lub qhov rais sill puag ncig thiab txhawb nqa tag nrho lub qhov rais los ntawm kev siv ntau yam khoom sib txawv rau ntau qhov kev taw qhia. Piv txwv li, lub taub hau qhov rais tiv thaiv txoj hlua, lub qhov rais jambs tiv thaiv ob sab ntawm lub qhov rais, thiab lub qhov rais sills tiv thaiv hauv qab ntawm lub qhov rais. Lub pob zeb ntuj muaj xim zoo nkauj, zoo nkauj thiab zoo, muaj zog thiab ruaj khov, thiab yuav tsis deformed lossis ploj xim. Nws yog qhov tsim nyog heev rau lub qhov rais sills.
Muaj ntau hom pob zeb ua qhov rais sills. Ntug ntawm lub qhov rais tuaj yeem txiav ua ib nrab voj voog. Nws zoo li tuab thiab zoo nkauj. Nws tuaj yeem tiv thaiv phab ntsa ntawm lub qhov rais, thiab nws yog puag ncig thiab tsis ua rau tib neeg mob. Nov yog ntau tus qauv tsim edging.
Vim yog cov khoom siv sib txawv ntawm lub pob zeb, nws tuaj yeem muab faib ua cov qhov rai marble, cov qhov rai granite, cov qhov rai travertine, cov qhov rai limestone, cov qhov rai sandstone. Nws tuaj yeem ntsia tau sab nraum zoov thiab sab hauv tsev. Cov khoom siv hauv tsev feem ntau yog cov qhov rai chav ua noj, cov qhov rai chav dej, thiab cov qhov rai da dej. Lub qhov rai bullnose yog qhov tsim nrov tshaj plaws. Cov qhov rai marble kev cai raug lees txais. Thov hu rau peb kom paub meej ntxiv.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-17-2021