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Several layers of aluminum foil, even heavy duty foil, is inadequate. Foil is too thin. Cheap aluminum foil is thinner than Reynolds. Reynolds aluminum foil is 0.64 mil thick. Reynolds heavy duty aluminum foil is 0.93 mil thick. Likewise, aluminum coating on mylar is too thin.

Since aluminum has only 50 to 60 percentage of the conductivity of copper, a thicker gauge of aluminum would be required to achieve the same shielding effectiveness as copper.

Most high frequency shielding problems are caused by openings in the shield material, and not by the material itself. Most conductive materials such as aluminum, copper and mild steel provide substantial electric shielding. At frequencies from 30 to 100 MHz, aluminum foil provides at least 85 dB of shielding effectiveness. Unfortunately, aluminum foil is extremely inadequate against low frequency magnetic fields, where thick steel or highly permeable ferrite material provides more adequate shielding.

Table of attenuation by aluminum by frequencies

Table 2. SE of Aluminium with thickness 20 mil

Page 8 of PDF and page 39 of journal. Page 10 compares attenuation of aluminum, copper, stainless steel and nickel. 'Characterization of Shielding Effectiveness of General Metallized Structure' by Avinash a, Mritunjay Rai b, Ravindra Kumar Yadav (2014)

Shielding effectiveness of aluminium - frequency-dB-thickness

Mylar does not shield

[Shielding: Aluminum] Comparing Shielding Performance of Space Blankets, Aluminum Mesh and Foil, Grounded and Ungrounded

[Shielding: Aluminum] Electromagnetic Shielding Performance of Popular Products, Grounded & Ungrounded

[Shielding: Aluminum] [Shielding: Radiofrequency] Thick Aluminum Sheets and Panels

[J] [Shielding: Magnetic] Thick aluminum foil weakens alternating current (AC) magnetic field more than thin copper foil.

[Shielding: Bed] [Shielding: Water] [Shielding: Radiofrequency: Aluminum] Surround bed with bottles of water with aluminum radiant barrier panels as a canopy.

[Shielding: Radiofrequency] Aluminum

[J] [Shieldling: Magnetic] Aluminum at least as thick as 1.6 mm.

[Mitigation: Mobile Phones] Forensic bags fail to adequately shield cellular and wi-fi radiation

[SHIELDING] Half Tube Sleeping Bag of Reflectix and Copper Screen

[Shielding: Radiofrequency: Reflection] [Shielding: Aluminum] Multiple layers of aluminum bubble insulation shields maser but not laser attacks nor heavy pressure on the top of the head.

[Shielding: Aluminum] [Shielding: Brain] 'Study on the effect of tinfoil hats on blocking mind control satellites' (2005)

[Shielding: Aluminum] Comparing Shielding Performance of Space Blankets, Aluminum Mesh and Foil, Grounded and Ungrounded

[Shielding: Aluminum] [Shielding: Room] Mike Matloff warned aluminum on walls can cause mold and does not shield as well as cast iron.

[Shielding: Lasers] Three mylar ponchos do not shield lasers.

How to Block Microwave Signals

[Brain zapping] Question: Anyone want to try mylar shielding right in front of these coil transformers (just my theory)