The electromagnetic shield features conferring to materials conformation of foam concrete that manufacture to decrease conservational contamination and to frugally applying it in definite buildings wall, was studied here. In this paper, the outcome examines of fly ash contents in the thermals conductivities, electromagnetic shielding, compressive strengths, and density of lightweights foam concretes is presents. This lightweight foam concrete contains of sands, cements, waters, foam, and fly ash to introduce air void in this mixing with low weight and high protection from electromagnetic signals. The foam mediator is weak in the water that give air pressures under foams producer to yield foam. The lightweight's foams concrete is produced with cement-aggregate percentage of 1: 4 and water-cement percentage of 1:1. Fly ash and sand varied between (30,20,1, 0) % in the weight of aggregate and foam contents is 40% and 30% of the volume of mortar. The foam contents increase produce low thermal conductivity, density, and compressive strengths of lightweights foams concrete. Hence, the waters absorptions are then increased with high fly ash percentage. Manufacturing by-product like ladle heater slags, gypsum, and explosion heater slags was enhance to creation foam concretes with improved functionality like sound and heat sound insulations and lightweight. The electric features like loss tangent and permittivity depend on the foam were intended and measuring. The measurements of free space is used to determine the electromagnetics shield characteristic of the truly manufacture foam concretes. It is definite that electromagnetics signal were enhanced blocking in case of the foamed contents is lower and the balst furnace slag contents was higher in the measuring frequencies band between one to eight GHz and about 95% of the electromagnetics signal is blocking over 4 GHz.