The fields use Slitfilm synthetic turf with sand-rubber infill. Buildings are mainly of timber, usually oak beams with wattle and daub infill, or brick. Herringbone is sometimes used as infill in timber framed buildings. It was built using a galvanised steel frame with buff sandlime brick infill. The timber frame is completed by rendered infill and Flemish bond brick, or windows. The most basic revetments consist of timber slants with a possible rock infill. YIMBYs argue cities can be affordable and accessible to all by building more infill housing. Plastic glazing infill is commonly used in many skylights and TDDs. New Urbanists have planned and developed hundreds of projects in infill locations. The new container area will require up to of infill materials. The 2011 Metro transit-needs study identified five additional sites where infill stations could be built. Wattle and daub was the most common infill in ancient times. As part of the infill project, it became situated inland. TriMet has built a total of six infill stations. FieldTurf does not use shock-absorbency pads below its infill.